Just a reminder, Zoro's main & only theme is about fighting & battle. He's supposed to be very good at it (like Nami with navigation, Brook with music, etc). Him getting the better treatment (battle strength, powerups, fame, reaching rooftop to fight Kaido, etc) is respecting his role.
So in the end, Zoro's PU is "better".
Do note, Sanji's battle strength isn't just about raw power like Luffy / Zoro, so Sanji's PU is also revolves around his tactical prowess, like stealth.
So in the end, Zoro's PU is "better".
Do note, Sanji's battle strength isn't just about raw power like Luffy / Zoro, so Sanji's PU is also revolves around his tactical prowess, like stealth.