Let's start with cost. Both headsets alone run around $1000 - $1200. If you build your VR ready PC, it's about $1500. If you pay Dell or HP, then it costs about $2000. We're already at $2500 minimum and we haven't even added the costs for Vive's wireless option which runs at an extra $350, so with wireless the cost is $2850 minimum; for the non-technical it could skyrocket to $3250 vs the Quest's $299.
Now let's talk about the "initial hill to climb" that most techies forget about. If you must deal with wires, then you have to do ceiling based wire control, where you mangle your room with ceiling hooks. For base stations, unless you have the perfect room with perfect furniture and you don't mind drilling into walls, it's a pain to set it up just right. It took me a lot of trial and error before I got it working flawlessly all the time. Let's also not forget that you need to install a wireless card for Vive's wireless accessory. Not everyone has both the skill and patience to deal with these time consuming annoying things.
Sure, there's no option for full body tracking, visual fidelity isn't as good, and nothing beats external tracking performance; but with Quest, it's $299. You put it on your head and you can play. I can buy a Quest for my mom.
Don't get me wrong, I really love both the Index and Vive Pro, but I am not forgetting about the work and costs associated with either platform
EDIT: I forgot the ritual I have to go through to get Vive and Index to work
1. Turn on computer
2. Put wires on ceiling
3. Turn on each base station
4. Turn on VR HMD
5. Turn on controllers.
vs
1. Turn on Oculus
2. Turn on controllers
It's bad enough where my SO "doesn't want to hassle" me just to play VR.
Oculus link gives you very good latency, but with the default settings the quality leaves a lot to be desired. You can tweak the render settings though, which fixes the issue, and it ends up looking about as good as Virtual Desktop. Only real unsolvable problem is the cable, but it's not a huge issue for me.
Alyx is quite playable through both of these setups (assuming good latency for a virtual desktop setup).