Content, price, and experience. It's fun to talk about SoC's and pixel count, but at the end of the day those don't matter as much as we like to say that they do. You can have the most amazing hardware in the world, but if it's hard to get content made for said hardware, and it costs too much, and it's too difficult to use... then it will fail.
Facebook is doing the boring work that people don't like to talk about in tech forums, and that's why they're able to make a compelling consumer product.
The only other VR company that seems to get this is Sony, and they're married to a 6-8 year product cycle.
1. It can connect with your gaming pc wirelessly. Also battery driven, so completely wireless.
2. No base stations, only headset and controls
3. You can run many games directly on the device, so no gaming pc required for for example beat saber.
4. Portable, you can bring it to your friends place.