It depends on what you're using it for
For "minute-of-comrade" shooting out to 300m while running an optic, I think an M-4 type is fine. If you intend to use it for target or varmint hunting, probably a full length version is where it's at.
Generally, though, I don't think you miss what you give up for the handiness of carbine length.
Personally, I'm an old -A1 guy...Happy Veteran's Day!