Some guys and I were having a debate on which Bending skill would be the best. CLEARLY water bending is the most superior. Think about it: Freezing, Healing and Blood Bending. Sure, with Earth, you have damn good defense (especially if you master metal bending) that can be used also as offense, but Water can be defensive as well. Fire is just useless unless you want to do some quick attacks and then Air is good for a quick get-away. Blood Bending can also grant you the ability to take Bending away from other people as well. Water erodes earth, extinguishes flame, and resists air. So yes, Water is the the best.
Jesus fucking fly off into the sunset on the back of a laser shooting pterodactyl Christ what am I doing with my life.