Quality and not too many cables
I chose this brand because I've used it on several PCs and the power supplies held up well. There are plenty of sockets, without going overboard in some cases, where at the end you don't know how to store unused power cables.
Our gamer PC has its power supply mounted at the bottom of the case, which didn't pose a problem even though the motherboard power cable had to be plugged in at the very top of the case. In short, good value for money.