Far too early to tell
The fact that we're seeing Saturn in action before we properly get a flashback of the fighting at God Valley does kinda suggest to me that Roger/Primebeard/Xebec characters might be stronger than Gorosei, or at least Saturn who's probably the weakest Gorosei
But Saturn does seem extremely powerful and well rounded. advCoC+ awakened mythical zoan + literal magic + tons of hax..... His entrance made a yonko and an admiral stop fighting to acknowledge it. That's insane
Lets wait a few chapters
The fact that Saturn is so old he carries around a cane should also speak volumes of how powerful he was in his prime btw