Interesting question. There alot of several Hulks proxies in DC around (maybe a natural reaction to the huge number of Superman analogs in Marvel, but I digress...). Some of them share some characteristics and some differences but the list is a little incomplete. Analize it.
I would take out Bane and Atrocitus. Depiste their hulking appearance, they don't have the same dichotomy as Jekyl/Hyde of Hulk. Both are monsters who have accepted themselves.
Man-Bat had that characteristic but his appearance and history makes him close to The Lizard instead Hulk.
Swamp Thing is more like a hippie Hulk, depiste the orign. Also, his main drive in the origin was self-pity instead rage, as the Hulk. Also, his powers and how he use them put them in another kind of characters.
Solomon Grundy shares the hulking appearance and strengh even if he existed before the Hulk, most of the times he has been worked similar to the Hulk, including the multiple personalities aspect.
Etrigan could be considered a "brother" of Hulk (same parent) with similarities, depiste the science/magic difference. Heis the most close to the Hulk, in the classic sense, yet his stories were more close to the terror tales. And Etrigan always has been more congruent personality wise than the Hulk. Always evil.
OMAC, would be an analog only if we are talking about New52 OMAC aka personalityless OMAC. The more classic OMAC was a rework of the Captain America.
Blockbuster, yes he was a Hulk analog, but for Batman strengh Level. More like a Mr. Fixit analog since some time.
And now we have Damage, who is an one hour Hulk, created by the army with a militar behind his trail... We must admit than is very in the nose, but of course the whole NAOS line was a big jab at Marvel.
There stil are several others "Hulks" around: Rampage (same origin as Banner), Loosecannon (who also changed colors), Doomsday (need I to say something about him?), Behemoth (remember that guy from earth-8?) and I know I'm forgetting someone else.
But we are wondering for who is the best analog and the one with more story potential. Sometimes that depends more on the creators in the moment and in which direction can you go with the character. Or you can with something very Hulkish (as in Damage) or go in another direction. But in narrative terms I say than Etrigan is the most probable.
Yet Damage is doing a decent work.