Look into the Pimax, think about your budget, their unique market position, and how good it is, if it wins it'll be a very fucking nice discount, vote for it!
The most advanced, most high-tech is definitely Google Cardboard.
Plus it is environment friendly and cheap. Who needs cables and handheld controllers, when you have no hands free, because you have to hold the cardboard with them :D I'll vote for Google cardboard, make VR great again!
No seriously, the vive's probuably the best one so far.
Disclaimer: I don't support Donald Trump or his ideas.
What about veranda vr? It was called totem vr at one point or something. There's also razers (it's okay it's one of the few "razered" products they sell) osvr. It's modular and upgrade friendly.