I have much more sexual experience than my SO. Mainly because I discovered the BDSM lifestyle earlier. Being a Domme it’s almost, in a way, required. This is all personal opinion though. To take on and have a submissive, I have to know what the heck I’m doing. Things can get out of hand and potentially dangerous otherwise.
In a “vanilla” relationship (please don’t take offense, it’s a term widely used in the BDSM lifestyle) I think that no matter who has more experience, it will benefit both partners in the long run. I mean, how much fun is it to learn something new between the sheets? I think I might have to go surprise my SO @ home now :D