FWIW, I use both and vastly prefer most things on the rift (especially flight and driving sims).

The room-scale experiences on the Vive are fantastic and definitely the direction this tech will go, but the majority of the SteamVR experience are... unpolished? That's the best way i can describe it. SteamVR itself is also extremely buggy, but I've also had USB 3.0 issues on the Rift, so there are some issues on both platforms.

But flight sims feel extremely natural (DCS World and Elite:Dangerous in particular), especially with Rift's ASW.