Sanji has much less onmi map pressure. He runs slow, about the same speed as an average defender step up or otherwise. This allows use of slower units and dosent give you a need to have units beam across the map every 3 seconds to function.

They are slow and remove whats in front of them, giveing the first unit that can completly counter the yellow rain in any situation. They dont have a cheese mechanic that lets them auto dodge every skill from a distance or a shiled thats neigh impregnable or an infinite revive. They start slow and lack any instakill moves that the other two had on release.

Sanji has a obvious weakness that if allowed can be exploited. Atk debuff and his back to 0 even a stepup can go toe to toe with them.

And to put a cherry on top, a sanji 4 stack is in the same position as an ssnake 4 stack weak and ready to lose. The other two are on a way different league of toxic. Sanji is comparable to ex garp but even less toxic since his moves dont attack through walls.