I prefer the AK47.
It is a good & strong weapon.
Now I'm recently using AK47 with FMJ in MW2, and sometimes I can say it's a lot better than RPD.
I've started using the M4A1 in Modern Warfare 2 quite a lot and I like it.
MW2 = ACR. I like the ACR because it has no recoil, which means it's good long range and short.
BO = Ak74u I'm not sure why I like this gun, but it's the only thing I used when I had Black Ops. When I played Black Ops, all I did was rush.
Famas was good in both games I think.. Even though it wasn't the same gun at all in both games.. They both get the job done.
Black-OPs:
M16 w/suppressor
Commando w/suppressor
L96A1 w/variable zoom
I would say my favorite weapon has to be the Famas. Love that thing.
AK47 with stopping power and ex mag
My favorite gun in MW2 is either the TAR-21 or the ACR. For Black Ops, Famas or AK74u.
-- Ambitious --
SPAS-12 in both MW2 and Black Ops.