P7...no, Tactical...no,Expert...no,P9...oh shucks! Get them all.
It really is hard to choose a bad HK be it handgun, long gun, sub-gun or grenade launcher. So far I've got the P7M8 and USP 45 Tactical and wouldn't part with either of them. However, my favorite caliber is .45ACP so maybe the Tactical has an egde, though extremly slight.
JJCII