I've listened to many a good film score and obviously my favorite composer is John Williams, but since everyone else is marking off by composer, here goes. I will go a step further by listing the composers from least to most preferable, but the scores themselves are in no particular order. (Based on what I heard of theirs which (except for Mr Williams, Randy Newman and Brian Tyler) is somewhat limited)
Michael Giacchino:
Rogue 1
Up
Hans Zimmer:
The Lion King
Pirates of the Caribbean
Alan Menken:
Beauty and the Beast
Aladdin (R.I.P. Robin Williams)
Howard Shore
Lord of the Rings
Nandy Rewman:
Basically everything he gave Pixar
Monk (I know it's not a film, but the AH Lads quote the theme all the time)
Danny Elfman:
Batman
Alice in Wonderland
Charlie and the Chocolate Factory
The Nightmare before Christmas
Brian Tyler:
Fast and Furious
The 2nd phase of the MCU
Formula One (again, not a movie, but just as heart pumping)
John Williams:
Harry Potter
Star Wars (To the Prequel trilogy haters, the score was epicly awesome)
ET
Jurassic Park
Indiana Jones