Which of these towers would you get and why?

I'm looking to replace my current PC with a two-monitor setup for a new tower with a three-monitor setup. I'm not an expert in this area and would love some feedback on which would be best for my needs.

I'm self-employed and the bulk of my work is done in Outlook, Excel and several web-based applications. I don't do any video editing and do minimal photo editing, where I used Pixlr. If any additional info may be needed to assess which tower would be best, please feel free to ask.

With that said, here are my current options. If a better alternative around the same price is available, I'm definitely interested. So...what do you think is best and why?

Lenovo Ideacentre 720-18ASU
$850.00 at Best Buy
3 GHz AMD Ryzen 7
4GB AMD Radeon RX 560
1TB HDD
16 GB RAM
1 HDMI
1 VGA
1 DVI
1 DP
6 USB Ports

Dell XPS 8920-7922BLK-PUS (This looks like I could only do two monitors??)
$899.00 at Costco
3.6 GHz (8M cache, up to 4.2 Ghz) 7th Generation Intel i7-7700
8GB AMD Radeon RX 480
1TB HDD + 256GB SSD
24 GB RAM
1 HDMI
1 DP
8 USB Ports

Dell XPS 8930-7401BLK-PUS
$899.00 at Costco (Reg. $999. $100 off until 2/4/18)
3.2 GHz (12M cache, up to 4.6 Ghz) 8th Generation Intel i7-8700
4GB NVIDIA GeForce GTX 1050Ti graphics
2TB HDD
16 GB RAM
1 HDMI
1 DP
I thought this had 1 VGA port in the store?
6 USB Ports

I'm self-employed and the bulk of my work is done in Outlook, Excel and several web-based applications. I don't do any video editing and do minimal photo editing, where I use Pixlr. I also have music or video streaming at all times.

I don't plan on doing any gaming but want a work PC that will last 5+ years.

Can you please explain what you mean by that? What could be upgraded?

When I was comparing, my eye went to the XPS 8920 because it had 24GB of RAM and (I believe) better graphics card. Does the newer Intel chip on the 8930 outweigh these benefits if I'm not going to do any more than basic gaming? Multitasking would be 98% of what I do with usually music but sometimes video.

What about the Lenovo would be better for me than the Dell's?

I very appreciate your expertise!

I've never upgraded any parts of a PC before, so let's take that out of consideration. What do you think of my last post on my thought process on the 8920 vs 8930?

Or do you think the Lenovo would be a better fit for me? I don't mind the extra $50 on the Dell's so don't factor in the price difference.

Thanks CountMike. Do you suggest I go with the 8930 with better processor and less RAM or 8920 with lesser processor and more RAM?