this is the guide I have from wow/economy on reddit - https://xpoff.com/threads/110-quick-...ide-bfa.80758/

the thing is if you have already antorus mythic gear you should stay on lvl 110, if you have new character for bfa you should stay at lvl 111, you can still have leggos and you will have acces to crafted 233 ilvl gear.