Alright.
Minato is great he got toad summons, rasengan, FTG and much more.
Jiraiya got Rasengan, Oodoma Rasengan, Earth and Fire release (Swamp of the underworld), he got tons of toad summons and toad techniques, he got the intelligence (Sometimes does'nt look like it lol), he is fast and strong plus SM. Ma and Pa, Goemon tons of sage art too.
I ask you once, when you say minato has that too do you mean Ma and Pa or Genjutsu? Well it is not shown that minato can summon them. Genjutsu idk.
Well if jiraiya had gone through his prep, Jiraiya wins.
If jiraiya can handle FTG (Which he probably can with his intelligence, he should be smart enough, not to let minato do so) if jiraiya enters SM and handle's minato's FTG or his kunai and stuff, then Jiraiya would win. Plus they got tons of jutsu both of them.
It will be high diff for both, but in the end i think Jiraiya would win, barely.
The only scary thing i see about minato is FTG, if i take that away i dont see him as that powerful but idk, well by hype and feats he is powerful.
Jiraiya wins with EXTREME Diff.
(Gamabunta and Jiraiya were good friends, but Gamabunta had pretty much his own will, plus he was a little ticked off by him summoning him to annoying places, so thats why he did'nt fully obey jiraiya)