Depends entirely on what you’re doing. Bleed node, caltrops, biohazard, omega is much better. Against regen, buffet, magik, ...etc, AA is much better. They’re damn near polar opposites. Against bleec/poison immune, omega. Run suicides, omega. Use void, mephisto, or sabertooth, omega.
If I was going blind into a quest, I’d bring omega. Double immune and isn’t handicapped by immune defenders. Plus he has great regen.
Archangel has the best aar in game for pushing 75% of content. Omega has some degen, life steal and bleed resistance. Rank him up get a couple neurotoxins on your opponent and you shut them down. Not really sure why this is a question. As if you want bleed immunity there are better options on the table then omega, same goes for the regen or degen really.
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If I was going blind into a quest, I’d bring omega. Double immune and isn’t handicapped by immune defenders. Plus he has great regen.