If you like decockers, and you can get the Omega version either way, you might like the Omega trigger a little better. Might. As I've always heard it, the Omega trigger guns are generally better new, but the standard trigger improves with use, and after about 400 rounds (or dry fires), they're close. It's also been argued that the older-style trigger has more tuning potential, but folks like CZ's Custom Shop and Cajun Gun Works are starting to develop parts and techniques to make the Omega system very good, too. Unless you're serious about spending extra money to tune either trigger system, that point is arguably irrelevant.
I recently picked up a used EARLY P-07 and am very pleased with the single-action trigger... much nicer than any standard [un-tuned] CZ single-action I've owned, and I've had a bunch of them. Newer models are slightly different and have user-changeable grip inserts.
If you can get your hands on both varieties (a standard 75BD and an Omega 75BD), dry fire (or if possible, actually shoot) both and see what works best for you. Dry firing will probably be enough.
With the CZ P07 or P09 (polymer-framed) guns, the Omega trigger is user- (or gunsmith-) changeable from safety to decocker (or vice versa). I'm not sure about whether the steel-framed guns using the Omega triggers can be easily converted to the other mode -- but assume they can't; someone else will have to address that and give you a real (rather than assumed) answer.