who's more powerful?

in the mega man X series who's the most powerful and why? thats what i wanna know. like zero's bad ass but is X stronger fully upgraded and what about bass and axl and stuff i don't know much about them but could someone help me better understand who's better and why?

....I think you need to upgrade from your super nintendo...

Same here

well no its just mega man x collection just came out like 3 days ago and i was just wandering