I mean, it is basically this ranking, right?
1. HTC Vive- Most expensive and steepest hardware requirements, best experience, can move around if you find that more immersive. Good for pc users, open source fans, and rich people that have the nicest shit. Valve/Steam
2. Playstation VR- Low barrier and cost of entry, most user friendly, plug and play, decent library of games even if they are just tech demos at this point. Good for people that already have a PS4. Sony/Playstation
3. Google Cardboard- Lowest cost of entry. Limited to experiences you can get on your phone. Good for people that love porn. Google/people with cereal boxes and scissors
4. Occulus Rift- Middle of the road quality, cost, and experience. Solid, but doesn't do anything better or more innovative than it's competitors. Good for pc users and people that love Mark Zuckerburgers. Facebook