Just kidding...it depends on the mission. The 53 is great for heavy lift operations, and troop transports. One of it's drawbacks is that it is so big. Sometimes there are problems finding LZs big enough to fit in, not to mention it makes one hell of a target.
The Hueys are small (can't carry a whole lot), and pretty quick. The Cobra is loaded with weapons and is what you want if you want to fly an attack helicopter.
And the 46...well...its...a 46.
I want to fly helos as well. However, I don't know what the competition is like to get them. The pilots I knew that put helos as their number one choice, got them, if that's any kind of indicator.
MPratt