I don't have "favourite(s)" so to speak, but I have enjoyed a variety of games over the years from different devs/publishers. Off the top of my head, I came up with these awesome titles:
Ubisoft (Prince of Persia series, AC:Black Flag, Child of Light, South Park)
Sq. Enix has also published plenty of good games accross many genres(Tomb Raider, Deus Ex, Nier)
EA/Bioware (Mass Effect, Dragon Age)
MS/Moon Studios (Ori and the Blind Forest)