Well, I'd say my bias is rather apparent... but I would have to say Gulcasa.
Hector is pretty powerful by himself, but he's only one angel...type...thing. Gulcasa has an entire army that is loyal enough to him that he could just sic them on Hector.
In a one-on-one battle... I'd still have to say Gulcasa.
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The whole Brongaa's-blood thing would give him an advantage. He only lost to Yggdra 'cause she's got the Gran Centurio; Hector, while powerful, is not strong enough to oppose/kill gods.