The Energon Pub

Who wins?

Thundercracker.

They're both reluctant warriors and they're aware of their mutual reluctance. They might agree to a non-aggression pact if it can be kept secret. 'You leave me alone, I don't try to kill you.'

If they do fight, Sunstreaker is more intelligent and has the same firepower as Thundercracker. If S can anticipate T's moves, he could land some hard shots and knock him to the ground. T would probably survive and go back on the offensive. S has superior armour and would last a long time in a firefight. T can use his sonic booms to put S off-balance. Then he could strafe and bomb the Autobot with less resistance. In the end, superior speed and manoeuverability would give T the advantage. S needs to find cover and score more hits on T. I would probably give this one to T since he could resupply at a nearby base and attack repeatedly while S is pinned down at least part of the time. S would either have to withdraw or die in combat.