We don't know yet.
And shingy, I'm saying trunks is pretty much statistically inferior (his balance of HP, speed, and attacks etc). Of course if you're good enough, you can beat anyone with trunks. It's just that it's easier to play with and own as just about every other character.
You might look at it like counter-strike: Picture trunks as a UMP. The thing is pretty bad, and you would probobly do better if you chose an AK-47 because it's simply a better overall gun, despite the few advantages the UMP has over it, like having less recoil and costing less money. But hell, if you're really good, you can get top score with a UMP every damn game. But that score could probobly be even higher if you used a better gun like the AK. The UMP can only unlock so much of your potential; it's limits are far below that of the AK-47.
The same way trunks is below the other characters. However the guns in CS aren't supposed to be equal; assault rifles are supposed to beat sub machine guns in terms of being a better weapon, and although a truly l33t CS m45t0|2 or whatever could own an AK-47'er using a glock, it's a hell of a lot harder to do. In ESF it seems they try to strive for balance. Trunks is below the balance.