You lag = They lag
They lag = You lag
It's Peer To Peer game, there's no advantages like you said the only advantage can be with the room creator since he can pick before the others (on the "others" screens) and it's not a real advantage but a disadvantage imo because his respawn can be delayed. It's just like a mirror.
and tbh i rather to play this game with laggers than players who complains about 30ms lol