If Sanji couldn't handle Black Maria's webs, will he really be able to deal with an Admiral's slithering, snaking, smothering vines? IMO, the Black Maria fight and Queen fight proved that Sanji's greatest weakness is bondage, so I expect Green Bull to neutralize Sanji with vines, then attack him with hard wood /s
I legitimately think Sanji can take Green Bull. Fire man with exoskeleton regen? Green Bull can't win. There's no way Green Bull is coming to fight, he'd get destroyed. Green Bull has another motive