lightning most powerful and versatile, it's almost too OP
same properties as wind when you apply it to a weapon/your fists or legs
can set stuff on fire
has the physical force of earth style since it can easily shatter stone and explode stuff
has the ability to increase the user's speed/strength
Fuuton is the most interesting imo. you can add it to kunai and shuriken, make blades or bullets, hover or even fly in midair, send or suck in the air to and fo, stir up dust clouds, and slice the air itself. plus it's useful in short to long ranges.
Katon is the most boring, it's basically the same jutsu all the time but in different shapes and sizes.