actually, after hunting down the original thread it seems Mega Man was winning the original thread due to being Tier 2, which no character in tier 3 would beat under any circumstances unless you are a 3-D being like Zeno. It's like pitting Flash against Archie Super Sonic.
Regardless, round 1 would likely go to Mega in an epic fight. Both have a lot of hax, most of it being countered by the other, in that -both can fly -both can solo DBZ (shots fired for Seiya) -Seiya has telepathy, but it's not Martian manhunter level and EXE is far above Geo who resisted mind manipulation on a country level scale from Gemini Spark, making it useless. -Hub has soul manipulation and it's pretty good but Seiya has control over his soul, meaning he could resist it. -both have reactive evolution as both can adapt techniques of their opponents and recreate them. -both have regen
HOWEVER, there are 3 things that put this in Megas favor. -both have matter manipulation, though i say Hub gets the decisive edge here since he also can manipulate Data and Energy, and I don't think Seiya can recreate every physical and metaphysical aspect of a universe with his matter manipulation. Additionally Hub is made of Data, not matter, so Seiyas matter manipulation is useless, while Hub could just turn into a brick with matter manipulation, a battle chip with data manipulation, and then proceed to crush him.
-MegaMan.EXE is easily capable of matching Seiya in close combat, and he is probably the Better ranged fighter.
-Mega Man has a time stop.
My vote goes to Mega Man 7 or 8 out of 10.
Round 2 is spite. Seiya has no way of getting past a tier 2 omnidirectional shield made of data, a tier 2 body made of data, and he'd easily go down if Hub even waved his hand at him, quite literally as Nebula Gray got the same treatment in BN5