Tough choice...Aoda is more of a speedy type of snake, and Manda two is all about over powering it's prey with it's big size. I'll pick the original Manda due to the fact it's in the middle of power and speed.
Snakes summons man...Orochimaru summoned Manda during part 1 and Sasuke killed him after he escaped the Deidara blast. Aoda was summoned by Sasuke during the war.