Water style is the best ever in my opinion: it uses mostly long ranged attacks that are sometimes usable at close range and they are mostly damn powerful, man
Well I don't think you can rank 'em like that. Each nature has it's own power.
For example in terms of raw destructive power fire reigns supreme. However for most fire techniques you have to stay still so you're at an obvious disatvantage.
Lightning techniques are very versatile and can be used in many ways.
Nothing will protect you better than a wall of earth.
As for wind, I see it as a great mix of versatility and destructive power.
Same applies to water, I think it's a mix between defense and versatility.
So in the end it'll all be up to your personal playstyle and preference.
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