by Suzanne Win­ter — If the power of Su­per­man resided solely in his su­per­nat­ural abil­i­ties, then Bruce Wayne's Bat­man would never have been able to com­pete on his level. But when the other fac­tors that su­per­heroes de­pend upon are ac­counted for — side­kicks, span­dex, sar­casm — both Su­per­man and Bat­man can claim suc­cess in the world of do-good­ery…