Average saiyan or average Kryptonian?
Krypto all day. You weakness doesn't exist on Earth, you're a super genius even not under the yellow/white sun, and you never age. Saiyans get old, and show no increase in their intellect regardless of forms. So even if for some reason I'm depowered, my raw kryptonian genius would have me engineer/invent damn near everything I needed to be Superman.