I will buy the Apple thing, too.
There are a lot of interesting differences between them (obviously, the biggest one being the price, and deriving from that) but the one I find interesting is Apple's decision not to have controllers.
This is just like the infamous "if you see a stylus, they blew it" approach with the iPhone. Double down on the simplest possible input mechanism and pretend it is enough. Today, of course, Apple ships an excellent stylus that they are happy to sell you for $129.
(UPDATE: I think here I wasn't clear, based on several replies. I'm not saying this decision was wrong -- it was right, clearly. I just mean they may very well ignore the existence of controllers... right up until they release an awesome high tech controller for us to buy (as an option).)
The controllers on the Quest Pro are fantastic, and although Meta also seems to be pushing as hard as they can to improve hand tracking and gesture recognition, too, there are and will always be immense benefits to having a hardware controller compared to just waving your hands and pinching your fingers. Precision, haptics, joysticks and buttons, additional positional audio, and more.
I have no doubt that if Vision OS succeeds, it will also eventually get spatially tracked controllers as well. But it is going to start without them.
That to me seems like the main competitive advantage Meta's Quest lineup has, other than the price. It's obviously superior in terms of delivering a deeper and more varied lineup of games; Apple seems to understand that and are hardly mentioning games (although, that makes sense due to the price as well).
It will be interesting to see how Meta tries to leverage this advantage. OTOH maybe some enterprising developer will just figure out how to connect Meta's controllers (or other similar ones) to the Apple Vision Pro.