You made edo tensei seem like a fodder jutsu, edo tensei bombs >>>>> rasengan & summonings. They have similar reflexes & speed (we havent seen tobirama's full reflexes but the fact that minato complimented him on it must mean that kishi is implying something). Minato has faster shunshin yes but tell me how that helps him get close to tobirama when he can teleport too?
Minato has kunai? well you just downplayed another one of tobirama's feats which is suiton, his suiton will be enough to wash away any surrounding kunai if his edo bombs dont do it first.
All in all, minato only has rasengan, a frog, & kunai to kill with, & no notable sealing feats which make him the winner. tobirama has bombs, water, & a sowrd if you want to count it. Tobirama's arsenal is more deadly on a practical scale while minato has to be more precise when planning out his attacks.
Tobirama has the power & experience advantage, their reflexes are basically equal, & minato has faster shunshin.
Imo it can easily go either way, tobirama=minato without fanboying U_U.