AMD vs Intel/Nvidia for portable VR machine

What is your intended use for this build? The more details the better.

Pre-ordered HTC Vive, want to be ready to handle pretty much all VR content at 90fps for at least next 6 months. Might also try my hand at developing content for VR with Unity.

What is your budget (ballpark is okay)?

Ideally < 1200

In what country are you purchasing your parts?

US

**Post a draft of your potential build here (specific parts please).

Not aware of any drawbacks with going with something like an 8350 / 390 vs an 4690k with gtx 970. After looking at some of the scores with the Steam VR Performance Test, it looks like using the AMD components will do just fine, I'm just not sure if I might be missing something. I.e. do I want DDR4 for VR?

I know that there will be new GPU and CPU generations coming out "soon", but I simply can't wait for those right now. I would like a build to use with the Vive (currently only have a laptop). It will probably be replaced/upgraded with the next version of Rift/Vive.

I want to be able to bring the case around for demo's, so the case should probably be smaller, with a handle, perhaps like this one

In a small case, will I be able to get away with the stock coolers on the CPU and GPU?

Should I care about m.2 SSD's? I'm definitely gonna have an SSD, probably a 500gb EVO 850 or something like that.

16gb of RAM - (DDR3 or DDR4?)

tldr; Are there any drawbacks with buying an amd cpu and gpu for vr? They appear to be better VR bang for your buck... My main goal is reliable, dependable VR gaming. (and maybe making a VR game)