People here are confusing most versatile with biggest arsenal.
Naruto can have a million techniques, but if they all accomplish the same thing, then he doesn't have a versatile arsenal.
A versatile arsenal isn't "A Rasengan that makes a blow, a Rasengan that makes a bigger blow, a Rasengan that makes a blow just as big but with fire."
A versatile arsenal would be along the lines of:
Techniques that immobilize
Techniques that offer quick movement
Techniques that offer healing
Techniques that do massive damage
Techniques for distracting
Techniques that defend against massive damage
Big Ball Rasengan, Lava Rasenshuriken, Rasenshuriken and Planetary Rasengan don't constitute a versatile arsenal.
Rasenshuriken, Sage Mode, Chakra Arms, the Magnet Rasengan, this is more along the lines of a versatile arsenal. Does Naruto have a versatile arsenal? Yes, but a lot of you are explaining why wrong.