Tomahawk, it can roughly do everything the Dragonfly can plus more.

FANG, because of nostalgia and you could have a squadron (which I did...over time). It was a early workhorse of Cobra.

The Mamba was bigger, more expensive, took up more space. Also, i'm cool with the futuristic concept, but I felt the Mamba needed two things, a bigger cockpit and landing gear. It had great firepower and one of Cobra's best pilots, though.

Additional comments on other copters:

Swampfire: rotor blade assembly was too fragile. Also, lightly armed.

X-Wing Copter: Hate the phallic machine guns. Needs landing gear, too. Vehicle seems cramped...to fit in price point, I guess.

FANG 2: Not actually copter, but whatever. I liked back when, but doesn't do much for me now.

Locust: Decent Joe minicopter, if unrealistic.

Retaliator: Needed bigger rotors and sturdier skids...too much weight on those skids. The crane thing seems absurd, but you can ignore it and use it as a heavy lifter copter.

Dominator: Fails as a tank and a copter. Where's the tail rotor? I've tried to like it, but just seems lacking.

Battle Copters: They are just gimmicks...never used them much.

Razor Blade: Decent colors, ugly design due to string racer gimmick.

FANG 3: One of the worst vehicles ever.

NAC: Has a tonka feel to it. Weird rotor design. Not bad.

Missile Storm: One of the worst vehicles ever.

Crimson Command Copter: Got one...never actually opened it. Maybe someday.

OK Max, I gotta go with the Tomahawk & the Crimson Command Copter!!! :D
Runners up for me are the Drangonfly & Fang!!! :)

The night attack copter and its variants (Desert camo and Crimson) are cool. Yeah, the rotors are weird, but as an assualt helicopter, I think if it was real I would fear it more than an apache! It looks like a flying tank! I would have no problems flying into combat in those suckers! But truth be told, I still love the Tomahawk best!

So far its a tie between the Tomahawk and the Night ATtack Chopper. (too bad we can't get ahold of those chap mei cargo copters and convert them to Comic Book cobra transport copters)

Tomahawk and FANG, I also like the Dragonfly as well though.

BINGO!!

I'm a sucker for the original choppers. :D

lol easy! the

GI Joe: Night Attack Chopper

Cobra: Crimson Command Chopper