Katakuri is the weakest YC1 , his bounty is pitiful and marco seems like he is weaker than he really is cuz when he was introduced the concept of haki was not fully fleshed out
He is the coolest yc though and probably the only one of them with CoC, I think he's going to get stronger and be the new captain of the BMP eos while the other yc1s are getting killed or quitting piracy