I think Quest 2 is an amazing entry point headset, by far the best bang for the buck, and you can argue it's the best experience overall, though the last one is a little more complicated a point.
Quest 2's big selling points are:
+ Wireless, both for PCVR and stand-alone. This is a pretty big deal, and while some other headsets like the Vive Pro do have add-on hardware to do this, the Quest's solution is simple, effective, and doesn't need any added bulk. It's by far the best wireless experience in VR, and that's kind of a big thing. Makes it easier to have multiple play spaces and take advantage of large spaces too.
+ Easy to set up/just works. No sensors to mount, no need to dedicate one space to VR. Inside out tracking works flawlessly, competitive with anything else out there. If you take it somewhere new, you can set up a new play space in seconds.
+ High res screens. A tad behind the Reverb but ahead of the Index. Really crisp, and clear, with virtually no visible subpixels or "screen door."
+ Great controllers and hand tracking, not the wand style stuff you see with some headsets.
+ Oculus game library does include some excellent exclusives like Lone Echo and Asgard's Wrath.
But it also has some disadvantages, though:
- It uses compressed video for PC connectivity, with no native option. For wireless this is true of any headset option, but even with a wire, the Quest 2 uses compressed video over a data connection rather than a video connection, which means some added latency and some visible compression artifacts. They're not bad or anything and you likely won't even notice in most situations but you can see in in the kinds of super low contrast scenes that are always a problem for compression.
- The FOV is not great. Similar to Rift and Vive and maybe a little smaller depending on your particular IPD and head shape. The Index and Reverb offer noticeably better FOV. IPD adjustment is also locked to 3 settings, so you can't fine tune it as much, which some people who are very sensitive to these things take issue with (though it's probably fine for 99% of people).
- It's a little more demanding on your PC. Because of the compressed video, you really need an RTX card. And since it's high res, it can be pretty taxing to play VR games at that res. Hopefully more games besides No Man's Sky implement DLSS and this becomes less of an issue.
- Battery life is a thing. It's about 2 hours wireless, but even plugged in, it still drains and you might get like 4 hours. I have never managed to play VR for two hours straight but if you're planning on doing coast to coast flights in Flight Sim or something you might want to consider that.
Index is probably your next best pick. Wider FOV, best in class tracking, cleaner (but not sharper) video, better contrast. But it's like three times the cost, lower res, and doesn't do wireless, so I dunno.