Going with Falcon Power here - just. The Warhawk D is heavier, has more armour & IS to clear, but the Grand Summoner has jump-jets, and greater speed. Unless duelling on a ping-pong table, and with a patient pilot, the Grand Summoner has the edge.
The Warhawk's loadout is ... interesting, but lacks the headcapping potential. it'll hurt if it connects, so the GS' pilot's job is not to let it.