My favorite score from my collection is without a doubt
Basil Poledouris - Conan The Destroyer
Christopher Young's score for Hellraiser 1 + 2 is also very nice. Also like scores for The Rock, Gone in 60 seconds, Con Air,...
My favorite soundtrack is probably
"O Brother, Where Art Thou".
I also like OSTs from Disney movies like Lion King, Tarzan, Brother Bear, Home on the Range.... And - I guess that's pretty weird - I really like the OST for Team America World Police.