Gogo could attack first. Go play Final Fantasy 6 and select his Mimic command without giving anyone else a command. See what happens? What's that? He attacks? Yep thought so. Delay Buster could miss. Gogo could have a Ribbon equipped. If Tidus gets Delay Buster then Gogo gets a Ribbon. Or something else that is decent relic wise. My vote goes to Gogo.