Minato, students tend to surpass the master. Although, Jiraiya was more accomplished with sage art than Minato, so that is an advantage. But with Minato's speed and basic grasp on sage art, plus being a genius and prodigy, would put him a step up. Minato was always good with ninja skills since the beginning, whereas Jiraiya (like Naruto) struggled to become great. Based on techniques though, I would say Minato would win since Minato can do anything Jiraiya can do (since Jiraiya taught it to him) plus more, adding on the speed and sealing techniques.