I think Capcom wins by a fair margin. I've been addicted to Mega Man since the instant I learned how to play a video game system. I used to draw my own Mega Man levels on paper and make up my own bosses. By the way, Mega Man X8 was a great game. Quite the improvement over Mega Man X7.
On the other hand, Konami did produce Contra 3 and Super Castlevania, which are two more of my favorites.
Regardless, Capcom wins out the end, solely because of Mega Man.