The FB loses for sure. Not much splash and a damn high overkill against T1 bots. T1 bots also got a lot DPS and there HP just wont matter as all T1 and T2 units die to one shoot anyway.. they also move fast enough to come close to the FB.
Btw: T1 bots are also good against T2 bots! Killed 3 (Cybran) T2 bots with something like 6 T1 bots.
Who do you think wins?
Watch to find out. It's about a 25 minutes game I think.