Without a doubt, the Tumbler.
Coolest design, and it comes off like an absolute monster. I never walked away from TDK or TDKR wishing I had a Batpod or The Bat, as impressive as they were.
But when the Tumbler drove over rooftops, evaded police, messed up garbage trucks, and came in on autopilot? I definitely wished I had a tumbler. Still do.