I'm curious about the ps4 version, but considering I already own and have played a ton of the game on PC already I'd really want to try it before I buy it. Would suck to buy the game again only to realize that it's just an inferior version.
If you already have the reaper of souls expansion, probably don't bother. If you only have the main game, I think it might be worth it. Lots of people seem to really enjoy playing it with a controller, and I believe a demo is available for PS3 and 360 if you want to get a rough idea of how using a controller with the game would feel.
There are also some console only exclusive features, but the next PC update will bring its own set of exclusive features--mostly tied to leader boards--so do your research before you decide which to pickup.