Transistor for sure. As games go, I'm also really fond of NieR, really fond of Final Fantasy X, and, hm, really fond of Mass Effect 3.
If you let me start rambling about my favorite incidental music this will turn into a neverending post, but I think my favorite movie score is probably Requiem For A Dream. If not that, Black Swan. Clint Mansell is a fucking wizard.
Ramin Djawadi is making a strong case for his inclusion in the top tier lately, too. Westworld has an incredible soundtrack. I initially wasn't that impressed with Game of Thrones, but last season? He did some absolute magic. Let's round this out by bringing up Cowboy Bebop because oh-my-fucking-god I could listen to Yoko Kanno and the Seatbelts playing blues-pop-jazz for literally ever.