I mix different libraries but what I tend to use with my band The Storyline a lot (we do prog, what a surprise) is Hollywood Strings & Brass. Check out our Youtube channel if you want to hear it in that context, you can find the link in my signature
For film music I use the Hollywood series and Stormdrum from EWQL, Albion, Omnisphere, some of my own samples, some Kontakt libraries etc... and usually layer my distorted prog leads under the biggest melodies as well!