Welcome to the final round of the world’s nerdiest bracket! To recap: we’ve compiled a list of some of the strongest, fastest, and strangest landbots and sky drones around. Your job: vote for your favorites.

We’re down to the last matchup, pitting BigDog, DARPA’s robotic pack mule, against the X-47B, the world’s first autonomous warplane.

The poll closes Friday, March 29, at 9 a.m. Check back later that day for the winner, which will go down in the historical ledger as the greatest land robot/ flying drone in all the internet!

BigDog or X-47B?