I'd pick it up on all the platforms. But as others have stated, it's unlikely any of the platforms will be better than the others when it comes to controls and graphics. The remaster will still use the rendered backgrounds from the original 1999 release, only with updated real-time lighting for the characters, and the controls should work just as well with a controller as a keyboard (iirc, the original game didn't use mouse input at all, you only walked around with the arrow keys and pressed the spacebar to interact with stuff - a control scheme that wouldn't be any different on a controller).
Just goes to show you how ignorant I am of the original! To be honest this is a huge relief, it means that its almost impossible to fuck up the controls on a controller
Grim Fandango isn't a point and click. It originally had tank controls ala Resident Evil if I am not mistaken. I imagine they will update the controls for the remaster though. In fact, some people modded the original to make it point and click for fun.
I haven't played it either but I plan to get it on PS4 just because I like my console so much, and want to see about the trophies. I think it will come down to a matter of which one plays more smoothly though for a lot of people.
its available for pre order on PSN right? I want that 'sweeet' theme