i think i'd take....hrm. i think i'd go with ultraman as plutonian was shown through much of the series, but if we focus on the evolved plutonian from the end of the series (after meeting the eleos, and undergoing some training) i'd take plutonian. and if you haven't read irredeemable yet, get on it.
abhilegend
Plutonian
leonidas
really....that's more surprising than me ranking supergirl above thor in strength....