I like Senor more, but I like the Sasaki fight better just because this is the only choice among the 2 which I consider to be a "fight"... The Senor one, I can't consider as such since Franky "nerfed" himself to Senor's level (i.e. play along Senor's "manly" game, no Franky Shogun, no launchers, etc.)...
But I would still want to see a Franky all-out battle... The Sasaki fight is so weird, Franky's not 100% when the battle has started yet he pulled off a W in a mid-diff battle...