Given what I've heard so far about the third game in BioWare's fantasy epic, I'm of the opinion that you should play Dragon Age: Inquisition. In case you need a platform qualifier to that statement, IGN has made a lovely graphics comparison video.
Judging from the video alone, the differences between PC and the two console versions come down to, as they often do, particles and lighting. The most dramatic difference can be seen at about 3:50 in the video, when the difference between the PC version and Xbox One is almost literally night and day.
Either way you slice it, this is going to be one beautiful game. It's just some versions are a little more shady than others.