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#11
Decent ATX motherboards have enough USB3 ports on them, and the speed isn't an issue because external drives are meant for their increased storage capacity anyway.
EDIT: And of course cables going into a hub that's on the table are much less of a hassle compared to having to crawl underneath the table to reach the back of the PC when usually there's too few USB3 ports on the front of the PC case.
It mostly depends on what you like to call a decent ATX motherboard. lol Adding a PCie card in a dektop PC very often limits the primary PCIe x16 slot to x8 speed so, if you are a gamer, then it's typically not the best option. The powered hub that I use was close to 90 Euros. It has 16 USB3 ports, and it uses a 100 watts power supply.