The reason I prefer the Rift:
* I am in a cramped space where my desk is and it would be impossible to "move around", even just 1m from my desk.
* The motion controllers of the Vive seem *great*, but then Oculus Touch controllers will be out as well (soon). Means I can get a Rift cheaper initially and STILL get the Oculus Touch controllers when they're available. Means: The price is likely ultimately the same and the Rift has no significant disadvantage over the Vive.
* Availability of demos
One of the biggest incentive to me for the Rift is that I can go on OR forums and download lots of demos/games etc. people already made for the Rift. Some are said to be fricking amazing! If I get a Vive I wouldn't even know where to go to get demos!
* Both sets use the same panel, resolution etc. anyway
* Rift is said to be lighter and more comfortable to wear
I am NOT saying the Vive is "worse" or the Rift "better", not by a long-shot, but in my case I just think a Rift makes more sense. If you have a dedicated area where you can (and you want to) walk around in VR, a Vive might be "better" for you and of course the fact you get the two controllers already included. I DO see that having actual motion controllers would be awesome for more immersion...but as said Oculus Touch will be out too, so no criterion for me.
if you do have a cramped space the rift camera is going to be problematic as well. accuracy with the camera is dependent on keeping you in the field of view, the closer the camera is the smaller the range of motion. with the vive lighthouse system there is no issue. even sitting with the rift could be a problem if you cant get good placement of the camera.
rift and touch do have a downside. touch controllers will require a second camera to reduce occlusions(loss of tracking). the additional camera will require additional cpu processing power for each object/controller added. the vive system puts the tracking processor inside the controller so there is no penalty for each item added. valve had 4 devs/hmds all working on separate things at the same time in their office with only the default 2 lighthouse units needed. while the touch controllers will probably have more versatility as inputs go, a generation or 2 will likely make both the touch and vive wands obsolete as they figure out new usages.
while oculus will probably spend more time on general vr experiences vs games, the ability to use steam and play non vr games on the vive as a giant vr 2d screen adds a significant bit of catalog.
while you and most others wont be using roomscale to begin with, the vive chaperone system is a significant feature that reduces the amount of visor lifting.
i get that you arent stumping for any one camp in particular, but there are significant differences in hardware. oculus will likely have to work way harder to make the intangibles more compelling. both camps wont be releasing major upgrades(4k per eye) until gpu are capable of handling the load, so you may be using the same tracking system for a few years. in which case the lighthouse system will be more expandable and less likely to require future spending.