Call of Duty: Black Ops or Call of Duty: Modern Warfare 2 (Multiplayer)?

I have both of these games, but I am a little torn between which multiplayer experience is better. In Modern Warfare 2, I like the weapons (especially the Sniper Rifles) and the killstreaks, but I feel like the maps are a bit too "camper-happy". Also, I really hate how grenade launchers can dominate an entire game, In Black Ops, I find that the weapons are dominated by Assault Rifles (In other words, assault rifles overpower all the other type of weapons - except for some submachine guns) and some killstreaks are kind of pointless (RC-XD), but I love the maps (Nuketown!)