Originally Posted by
flyzabit
Status-based advance domestic upgrades without needing upgrade e-cert, like DL/NW, CO, and US.
If that's no item, then rollover miles would be nice!
As a (typically) mid-tier elite, I actually prefer having to use stickers, since I seem to have a much higher upgrade percentage than what I've had with non-sticker-based Airlines.
I'd vote for rollover miles!