If you're talking about digital ICs then you'd have the advantage of wider operating voltage ranges, greater noise immunity (as compared to TTL), and lower power consumption. I really don't know if, given the types of circuits you build, those characteristics would be of any benefit.
Some folks find designing with CMOS ICs to be problematic, and still prefer working with TTL devices--but I've met very few of those.
I'm still not sure what kind of devices you're talking about, because 'CMOS' (Complimentary Metal-Oxide Semiconductor), per se, is a device construction style/technique/process/method (whatever is most meaningful to you) for a wide range of devices.
Your question is roughly analogous to asking, after returning from the auto showroom, if you should buy a uni-body car; to which I would reply, "What kind of car do you need?"