Black Ops!
It's going to be much better than mw2, because mw2 is crap. cod4 FTW!
Anyway, in Black Ops when you get kills from your killstreak they dont count towards your next killstreak:
e.g. say I get my pred out and get 2 kills, I would have my harrier, and if that gets 4 kills you get your chopper.
However, in Black Ops kills dont carry on from your killstreak:
e.g. say I get an RC car (3 kill streak) and get 2 kills with it, you DON'T get your napalm strike (5 kill streak). You have to get your next 2 kills with your actual weapons.
This means there won't be noobs camping with a grenade launcher untill they get there 5 kills, then their harriers, then chopper gunner, without using any skill.
You actually have to work to get your kills. This will seperate the good from bad players, and will make the game really good.
Theres also some new game modes in Black Ops that look really good.
Medal of Honor doesn't have anything new.
Here are the killstreaks in Black Ops: Much better than mw2's:
3 Kills – Spy Plane
3 Kills – RC-XD (RC bomb)
4 Kills – Counter Spy Plane
4 Kills – SAM Turret
5 Kills – Care Package
5 Kills – Napalm Strike
6 Kills – Sentry Gun
6 Kills – Mortar Team
7 Kills – Attack Helicopter
7 Kills – Valkyrie Rockets
8 Kills – Blackbird
8 Kills – “Rolling Thunder”
9 Kills – Chopper Gunner
11 Kills – Attack Dogs
11 Kills – Gunship
Soooo... You should get Black Ops instead of Medal of Honor!