Can't speak for the Rift other than to say the Vive's room-scale features/techonology and front-facing camera are a league apart from it, that's not an opinion, that's just comparing the two devices spec to spec.
The Vive is made for clearing out a space and having a holodeck style experience... ducking under blades swinging out at you, crouching behind cover to avoid being shot, spinning around to fire a bow at someone behind you...
For sitting in a chair, the Rift is probably better as that is all it was designed to do at the outset... it's lighter, and has been around longer.
I stick with TrackIR for Sims... you can't see your controls/maps/beer with a VR head-set on. For Aces, because it's got a much more prominent social/tactical text component than any of the other modern sims I have flown (War Thunder, IL-2 BoS/CLoD)... and VR isn't good for reading that type of text, especially out of your main line of sight.
One thing to ask yourself is whether your computer is man enough to handle any individual game in VR... you're rendering twice, once for each OLED in your headset... I have a hoss laptop with GTX 970Ms in SLI, a fat proc, and 32 GB of RAM... since they don't yet take advantage of using one GPU for each eye, I have trouble running things like Hover Junkers (even though it's an amazing experience, it chugs butt)