Pre timeskip.
Fan of Zoro and Sanji, Luffy was ok but wasn't a fan. There were times I rooted for Luffy, like in Marineford tho.
Post timeskip, all three characters regressed a lot.
Don't like Luffy, actually started actively hating him after G5.
There is no mr prince or detective shenanigans for Sanji anymore, and his perv/mean side is more highighted.
Zoro just became bland AF
I still like Zoro and kinda like Sanji. I'll go with Zoro and Sanji fan.