Wasn't Synnar beating the absolute shit out of like Superman, Orion, Kyle, Wonder Woman, and Martian Manhunter at the same time? He looked like he was stronger then them put together IIRC.
That was even before he gained the power up. He was basically an alternate version of Thanos in the DC. That alone guarantees Starlin would have had him beat the shit out of Hunter Prey.
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I think DD defeating Orion and MMH in less than a minute when Orion had the intention of finishing the fight, gives me the impresion that DD has a slight advantage on a slugfest.
I think DD wins but Synnar will make him work.
But also I am not considering any power ups superman or ww might have at the time of their battle with Synnar.
Is a pretty close match Imo, but I think on the long run DD will prevail