It's a close match between namor and archangel, but since omega red can fulfill the role of damage over time, namor can help you fulfill the role of Ignoring unavoidable damage from some abilities.
It's a tough call between AA and namor. Yes namor is getting a slight nerf. But not to his sig ability. AA isn't nearly as good without his dupe. But with it he absolutely wrecks anybody who isn't immune to bleed or poison. That neurotoxin is deadly and absolutely shuts down and melts opponents. No matter who you pick though both need high sig levels.