Out of all SH's I think characters have the best chances against Sanji and Chopper. But when the campaigns for Margarette aren't good I will vote for Sanji (despite his super annoying moments in the last arcs).
After all Sanji is around since the beginning, with loads of cool moments. If the campaigners manage to remind the folks of them, he will make it.
You're just voting Sanji for Kishido's sake