The obvious choice is lightning.It far more verstaile than wind, or any other jutsu for that matter.Out of all the nature elements it's has been shown to be the most versatile and the best looking.I mean, if you had Wind Armour what would that do beside make your farts travel further, thus stinking up more of your surroundings.Lightning is the only Nature element that can be used as a Sheid(Raikage's Lightning Armour), a piercing stab that can penetrate almost all defenses(Kakashi's Raikiri, Sasuke's Chidori, and the most powerful Third Raikage's Hell Stab),an amplifier for speed(The Raikage's lightning armour)a jutsu that can destroy mountains and is unavoidable without an ultimate defense(Sasuke's Kirin), and it's the best collaborative jutsu, as it can be added to water element attacks to strenghten the detructive force.Fire isn't as versatile, water is less destructive, earth has less collaborative qualities, and Wind isn't as versatile or destructive.I mean, beside Naruto's Rasenshuriken, name me one other wind jutsu that is powerful?None of the wind nature users jutsu could even scratch the Third Raikage and even the most powerful Wind element, Rasenshuriken didn't hurt the Third Raikage, as Naruto could assess.