I suspect there may be some UI differences in regards to the DR-side UI - and even if there are, it is at the core the same game. The PW UI is very PC-focused - which has also been a source of complaints over the years. Then again, if the plan to support a "Legacy" version works out, then you can pick whichever you want. Having played all three extensively - I would personally pick the "mobile" UI (obviously customized for consoles/TV) if I were playing on a gamepad. PC is my first and best, of course, but that I play almost exclusively with M+K.
Given how some things work, I do not know if "Legacy" will be an all or nothing affair. Regardless, I always encourage folks to give things a try before they just make assumptions and not try new stuff.
Why would it not be? Confused by that one, honestly. In what regard is your concern?