From GAF (what a change).
Dragon Age Origins
Xbox 360 (59%)
PC (41%)
Note: The PS3 version was released 2 weeks later.
Dragon Age II
Xbox 360 (57%)
PlayStation 3 (22%)
PC (21%)
Dragon Age: Inquisition
PlayStation 4 (43%)
Xbox One (30%)
Xbox 360 (12%)
PC (9%)
PlayStation 3 (6%)
PS4 domination is the best.