I think the J9 would give the Destroyer a run for its money. The only thing really in its way is your massive ion cannon, but the way to get around that while closing the distance would likely involve a curved running path to get behind you and then staying in your blind spot till in close range where your thick armor means nothing to J9 and his spray.But that is all betting on being able to avoid the ion cannon by staying away from your Frame's left side.

Though if the Destroyer got the drop on J9 from afar I can see a one shot, one kill scenario if he punches though my chest and detonates all my canisters. I can see the same happening if her used those drill missiles on me.