Welcomet to DC
With DL being a good battery that's meaning I should start out with him right? As far as the characters I use in AE I play Gouken, Honda, and Makoto. And then in Guilty Gear i play Baiken and Sol. I know Gouken and Makoto have to have some type of mixup game to win. So I geuss DL would fit with me well.
I don't know much of anything about AE, but based on your characters in GG, I'd say Clark fits you more than Duo Lon, since Sol and Baiken are about basic mixups, dealing solid damage whenever they manage get a hit (with a rushdown style that's more about overwhelming pressure than the tricky mixups of Millia, Eddie, Slayer, etc.), and having good defensive tools in arguably the game's best DP and infinite guard cancels, respectively. Sounds similar to Clark using straightforward 50/50 mixups, doing Clark damage, and being able to SAB his troubles away against overly-aggressive opponents.
Really, though, give both a try and just go with whoever you enjoy more.