[KenWittlief]

I think there was a poll on this a while ago and the result was that far MORE teams use single stick instead of two.

there is no combination of inputs you can get from two sticks that you cant get from one - and I would say using one stick IS more intuitive - you want to go fowards, you push it forwards, you want to spin right you push it right, you want to go forwards and right, you push it forwards and right - what could possibly be more intuitive than that?

two other advantages - the one stick stepup gives you a 'turn' command signal that you can use in conjunction with a yaw rate sensor to close the loop on steering

and one stick frees up the drivers other hand for another control, to point at the field, to scratch his nose...

and you can use the superfulous second joystick for some other function on the bot, like controlling a robot arm and claw.