It's a fairly close fight, but I'd go with Sunstreaker here. He's a more powerful, capable, and ruthless fighter overall. Yes, Tracks can fly, but if Sunstreaker packs enough firepower to shoot down a Decepticon jet, a low-flying car with wings should pose little trouble for him.
Now, if you put Tracks against Sideswipe, I think he'd have a much better chance. Sideswipe is a very skilled fighter, but not nearly as powerful or ruthless as his brother. He has limited flight capability, but Tracks outmatches him in the air, and these pile-driver arms won't be of much use unless he can get close enough to his opponent.
BUT--if Sideswipe and Sunstreaker team up together (as they always do)...Tracks is a goner.