Why is the better of 2 Asus B450 motherboards cheaper in price?

Wanting to buy and reading here and there about motherboards I came upon these 2:
Asus ROG Strix B450-F Gaming vs Asus TUF B450M-Plus Gaming
I don't know if I can post links here but on a few websites, for example, versus, these 2 motherboards have similar specs, an equal overall score but one is preferred showing this:.
Why is Asus TUF B450M-Plus Gaming better than Asus ROG Strix B450-F Gaming?

• 800MHz higher overclocked RAM speed?
  4400MHz vs 3600MHz
• Supports ECC memory?
• Has USB Type-C?
• 1 more DVI outputs?
  1 vs 0
• 61mm narrower
  244mm vs 305mm

But this better board is actually about $40 cheaper. How can this be so? If they were from 2 different manufacturers I'd understand but they are not. Can anyone help me please. I was going to buy the more expensive one but then I saw this (based on what a vendor suggested) so now I am confused--totally.

OS: Windows 10 home, latest update:

ASUS USA

(Link is to a comparison of the two boards.)

The RoG series is nominally higher end than the TUF series. RoG has features to aid in overclocking.

To represent my opinion of the value of those, my primary system uses a TUF Gaming X570-Plus board.

Grom0X said:

And also TUF B450M-PLUS is a mATX (microATX) board!

Right. I missed that. At Newegg, the full-sized ATX version is $28 more than the microATX. The RoG ATX model is $4 more than that.

Thanks bobkn and Grom0X
So the ROG may be officially higher but perhaps not really. I went to your link but unfortunately I do not know enough about these specs given to give me information I can use. I am knowledgeable yes but only to some degree, I am not in IT and only self-taught. In other words I still don't have an answer to my question.
From the specs I gave only the 1st three have some sort of meaning:

• 800MHz higher overclocked RAM speed. - 4400MHz vs 3600MHz
• Supports ECC memory?
• Has USB Type-C?

And this tells me that the less expensive one is better. And the words "nominally better" also suggests it isn't necessarily better hence is it better or why is the other cheaper remain open questions for a simple man like me.
How I use my PC is to some degree for gaming though I am not a heavy gamer and I only buy games that are 3 years or older. I do quite a bit of Photoshop but I use the older C6 and not online (not thing I will change this for a few years.)
More feedback would be appreciated, but if not, I thank you nevertheless.

The cheaper one that you list is cheaper mostly because it is a microATX board, rather than a full-sized one.

mATX boards typically have fewer slots for peripheral cards (like the graphics card). They may also hav efewer RAM slots, but the Strix and the TUF have the same number.

ECC memory has an extra bit per byte to allow error correction. It is rarely available on desktop boards. It's mostly used on servers. (I wonder whether the TUF actually can use error correction?) ECC DRAM costs more than non-ECC RAM, usually.

If you want to know more about RAM support, download the QVL (qualified vendors list) for both boards. (Incidentally, DDR4 4400 appears on the list for the Strix. Whether it supports running at that frequency, I don't know. All faster RAM will probably default to DDR4 2133; you'd have to turn on XMP in the BIOS settings.)

USB-C is nice, if you have any USB-C devices to plug into it.

What CPU do you intend to use? If it's a Ryzen Gen3, I suggest getting an X570 board rather than a B450 one. There don't seem to be a lot of mATX boards available (at least at Newegg), but serviceable ones start at about $150. The Asus TUF Gaming X570 Plus (not the WiFi version) is $165. It has two PCI-E 4.0 M.2 slots.

thanks again obkn
The CPU I intend on buying is the Ryzen 7 3700X
As to your suggested MB, yup I had read about that one being better but it's also about $50 more expensive, in the States, isn't it? Hard to say sine there seem to be so many same but different models (besides the wi-fi, I also saw desktop and a few other factors like these 2
"ASUS AM4 TUF GAMING X570-Plus ATX with PCIe 4.0, Dual M.2, 12+2 with Dr. MOS Power Stage, HDMI, DP, SATA 6Gb/s, USB 3.2 Gen 2 and Aura" at $165
and
"ASUS TUF GAMING X570-PLUS -ATX-Socket AM4-USB-C Gen2, USB 3.2 Gen 1, USB 3.2 Gen 2-Gigab" at $415
Beats me if I can tell the difference why one is twice the price of the other in this case. And aren't they the same one you mentioned?
Unfortunately the rest of the world has a tendency to sell stuff at higher prices the the US--no rebate coupons either. And though everything seems to be made here where I am now (China) name brands are more expensive still. The $40 dollars difference I mentioned is actually $75 higher here. And I am already spending about $100 more than I anticipated for my PC build (And this does not include monitor, keyboard, mouse, since I already have those.).
But truth be told it is taking me forever to actually buy this computer (it has been 6 months since I started being ready to buy it). The main reason being the language barrier--my Chinese sucks and I can't read it for beans.

All that I can think of is that they are the same board.

I've been shocked in the past that Amazon has listings from "marketplace" vendors that are much higher than the normal price of an item. I suspect something similar here. The TUF Gaming X570 plus is $165 in the US at Newegg. It's the same at Amazon. I see one Amazon Marketplace seller (globaltechstoreqc001) that has it for $322.49 plus $57.40 shipping. Why on Earth would anyone go that way? (They don't appear to be a US based company.)

You're a Quebecois now in China? Must be nice to be in a place where COVID-19 is under control. (I don't know enough for that to be irony.)

Thanks bobkn.
In Quebec and perhaps elsewhere in Canada, often a Quebecois is French, Canadian and I am not. Technically anyone from there is Quebecois but more exactly, as an English speaker you'd say Quebecer and then you're OK. The minute you say it in French within an English sentence that changes.
Anyhow, I assume by "the same board" you are referring to the 2 I mentioned and not yours. But you did mention that it was smaller (and so did the rating) and I wonder why this would be considered a plus except that it could fit into a smaller tower. But you also mentioned, being smaller, it has lesser slots, and I would consider that a negative and not a positive.
I will be adding an nVme SSD, a normal SSD, 2 HDD, a DVD player, SD card reader and an internal wi-fi card to this board. Hence knowing so, I am wondering if I should be getting the bigger card after all.
Side note. Can you tell how little I actually know about these things? :-(

Sorry. My familiarity with Quebec is limited. I attended a scientific conference in Quebec City/ St. Foy in 1997. They didn't give me much of a hard time for not carrying a passport. That was a a francophone area. I haven't been North of the border since.

I have never bought a microATX board, as far as I recall. Even though none of my builds has required the extra capacities found on a full-sized ATX board. Guess I'm just a MB size snob. If a mATX board has all the features that you need, there's no reason not to buy it.

I'd still push an X570 board, but they're still more expensive than B450. I doubt that you'd see much advantage with the X570, unless you get a PCI-E 4.0 M.2 card. Again, more money than a PCI-E 3.0 one.

In case you haven't noticed, people on the Internet are always pleased to spend your money for you.