Voted Apoc because I think he gets more out of the additional damage at r3.
If you're headed in Abyss exploration anytime soon though I would go with red Mags. You definitely feel the r3 difference there against Darkhawk, IMIW etc
Apocalypse just melts stuff and you generally have to whup some butt with him even if you plan to make another mutant a horseman and have them as your main path clearer. Even with Cable giving you max charges after the first fight, Apocalypse still loses them all when he makes someone a horseman and I always prefer to have him at max charge when I face off against the boss. Climbing back up to 4 charges is greatly helped by r3'ing him.
I love my r3 Apocalypse. Pistol-whipping fools never gets old when the pistol you're whipping them with is actually a Giant Mutant Space Laser Assault Cannon.
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My 6* mutants
If you're headed in Abyss exploration anytime soon though I would go with red Mags. You definitely feel the r3 difference there against Darkhawk, IMIW etc
I love my r3 Apocalypse. Pistol-whipping fools never gets old when the pistol you're whipping them with is actually a Giant Mutant Space Laser Assault Cannon.