Pavelow – Kills everything on the ground; better than a Chopper Gunner and gets me more kills.
Harriers – Best value killstreak, still pretty hard to get but any decent player can get them often
Stealth Bomber – The coolest killstreak in the game. Can wipe the entire enemy team out. 9 kills is a bit too high, if it were 7 it would be the meta killstreak
Tactical Nuke – Pretty obvious
UAV – The most useful killstreak ever. Literally tells you where most enemies are. What more could you want?
Emergency Airdrop – Most chaotic fun killstreak; can be stolen but can get you great rewards
AC130 – Vastly superior to the underwhelming Chopper Gunner; has to reload but far harder to shoot down, you can easily get a nuke
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Predator Missile – Always good for a kill or two; best "bang for buck" killstreak. Can be inconsistent sometimes. Sleeper combo is 5-11-25 (Predator, AC130, Nuke); on Ground War it can get you the AC130 singlehandedly with enough luck
Precision Airstrike – More inconsistent than Predator Missile but actually really good for Domination Ground War. Can easily get 5+ kills with the right placement
EMP – A bit too high (12 kills would make more sense), but extremely helpful to keep sweaty snipers from spamming Harriers and Pavelows
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Counter UAV – Decent but easy to shoot down. More of an annoyance than anything else
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Sentry Gun – Can get a fair amount of kills, but it's hard to want to use it because you can't use it to obtain any killstreaks
Care Package – Can get you a decent killstreak, but more often than not you get ammo
Chopper Gunner – Very underwhelming half the time. Too easy to shoot down; if it had another flare it would be far better. Should probably be 9 kills instead of 11, if you want it to be easy to blow up
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Attack Helicopter – Enters the map, proceeds to miss 3/4 of the shots and get blown up. Literal trash