Afro-Magus was slapping Thanos around. So yeah, he wins. Infinity War Magus would make a good fight of it, and could win in some circumstances, but not most.
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Someone needs to reread that story. They were stalemating for most of their battle and Magus only overpowers him right at the end in the last energy blast exchange. And Thanos had just expended a lot of energy putting down 20,000 Black Guard members with Warlock (as you probably do remember. )
I don't think I remember Strange Tales Magus, but the Magus who fought Genis would beat Surfer.