Obviously Sanji fans because Zoro is portrayed as the overall stronger of the two.
Sanji doesn’t have a lot of strength showing that puts him above Zoro but it doesn’t mean that by the end of the series they’ll be near equals.
The only thing that Zoro has over Sanji that puts a noticeable difference at the current storyline is Zoro possessing AdCoC, if Sanji obtained it or a similarly potent ability then they’ll be equals again.