Uematsu, definitely, and while I haven't played many Final Fantasy games, his music is just amazing.
I *have* at least played a couple of Kingdom Hearts and Mario & Luigi games and I have to say, Shimomura's music is pretty damn good, and I look forward to hearing her work in FF XV and KHIII in the coming years...ish...
Kondo just for historical significance, but also because his new mixes of songs on Super Mario Maker, during the Maker session, is pretty damn good. The music changes as you work on making a level, fading different elements of the music in and out of the main track, while creating an aural experience that is always fresh, keeping level-making and editing a fun time!
And Meguro, because of the music I've heard from Persona 3 and 4, as well as their spin-offs and anime, and what I've heard of the Persona 5 OST from trailers and such, his music continues to astound me as the years go on. One of the freshest game composers I've heard in years!
Of course, JRPGs continue to feature some of the best video game music, and I doubt that'll ever change, especially with such a wide array of talented composers working on those JRPGs!
-Marc.