Performance. Though I would expect it's already gone if you didn't pull the trigger yet.
I should have prefaced this with the fact that I put a deposit down on it shortly after my post. So now I have both the 2021 AWD LR I had on order and this demo 2020 M3P+ in my account. Now I'm just trying to decide between two. Opinions have been mixed but I'm sure either car would be great.
...I should have made this a poll.