rexy vs chicken walker

I would have to place my bid on Rexy. Rexy never lost. The AT-ST failed badly and a Wookie broke in so... Rexy for the win.

no problem

I would have to go with the AT-ST. My first reason is the same as Rex Fan's, the AT-ST could shoot the rex before he even knew it. My second reason is that animals just do not know how to fight machines. Sure, if rex could find a way to knock over the AT-ST then it would "win" the fight. The problem is, animals do not know the things we know, rex very well may first try to bite the AT-ST which would be a mistake and make it a big target. So, I choose AT-ST.