I would say that really, narrowing down to something like granular or VA or analogue/samplers etc would not necessarily be a good way of choosing something for scoring.
Something versatile sonically, yes. Easy to pull new sounds out of would be a bonus too or with a great range of inspiring presets when you're on a deadline.
I haven't 'scored' anything as such (except a student film in the 90's), but would like to look at doing so in the future and am starting to work on a workflow and creation process, working to deadlines (as a result, I've finished more tunes in 3 months than I had in the previous decade!!). I've a wide range of synths in the studio- analogue, VA, ROMplers and Acoustic Modelling.
I am very influenced by sounds for my initial ideas and my output is starting to be very cinematically inspired anyway. The track linked below started with a Blofeld patch (the main one on the melody and bass notes throughout), called Blocked- hence the track title. Everything else is standard Kontakt library- piano, drums and strings, plus my WSA-1R for a plucked bell sound, filling the bass. I just found sounds that worked with what I had already and in my head. https://soundcloud.com/atomsun/2-blocked
I had the main melody/chords about six months ago and finished the writing/recording over 3 days last week- literally scanning through a library to find something that worked.
I'd say a good quality, versatile synth will all the bread and butter sounds- pianos, drums, orchestral and the usual synth leads/bass/pads etc would be an ideal core for the studio, with some analogue/VA or other synthesis on top to add the interest.
So- something like Kontakt or Hypersonic 2/Halion Sonic, or a hardware workstation like the Yamaha Motifs, Korg Kronos/Krome for starters, depending on budget.
Then, something like a Virus, Evolver, Prophet '08 or U-He, Alchemy etc to fill in more esoteric stuff.
It also depends on how versatile you want to be with musical styles as to what sounds you want access to.
If you're working to deadlines, you need to really be able to get around a sound library quickly and find an inspiration. I can't imagine I'd be doing that with, say, just my Prophet or Blofeld.
Question is- how do you define cinematic? From my example, I think Blocked is halfway between an early 80's synth-pop anthem and a montage scene from an 80's movie (a colleague in the office said 'Top Gun'!!). The bit that makes it for me like that is the build up just before the main melody kicks in for the last time and the way it all expands.
But that's just my opinion...
To be honest, I've still got a sneaking suspicion several people have done that melody before.. :D