Water and Wind are my two favorites they are both power elements they can both be used anywhere given that u are powerful enough and there effects are devastating.
eg: Orochimaru's WIND ELEMENT GREAT BREAK THROUGH
Tobirama's Water Release Water Shockwave
Frie is a pritty weak element ppl think fire easily beats wind but it is not so a wind user can easily turn fire tech back at it user. Unless you are really powerful fire won't beat wind head on.
Lightnening is pretty cool to but not my fancy
Earth is a powerful element to but it not my style, wind can easily turn it into dust and water will just own it.
But if you ask captain planet they are all meant to work together "RITE CAPTAIN PLANTET......
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^^ Yeh kid the power is yours or whatever.......do you have a light?