I'd go CMM before nick, especially if you're in 5.4. she literally destroys all of it at r3 5*. I used my r3 in act five and each fight took 15 seconds. I'll record me doing a path with her right now if you want convincing. her damage is insane and will walk through the entire quest for you.
Between NF and CMM you can't really go wrong. I personally prefer NF to CMM. CMM isn't going to help you on Ultron in 5.4.6 because she's just designed to debuff basically every other hit and managing her binary and armour breaks in between Ultron's phases will make her a bit naff, equally there's a lot of mystic bosses in 5.4 and she's going to take a fair bit of extra damage unless you're going into the fight pretty much at 20+ charges. With NF on the other hand you can play against Ultron virtually stun immune if you can time his phases to get unblockable. Just back off until he's holding a solid block (might be worth checking some Nightcrawler switching videos) and then beat into him with 5 combos and bait sp1s, you wouldn't debuff him after the initial two sp1s.
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CMM isn't going to help you on Ultron in 5.4.6 because she's just designed to debuff basically every other hit and managing her binary and armour breaks in between Ultron's phases will make her a bit naff, equally there's a lot of mystic bosses in 5.4 and she's going to take a fair bit of extra damage unless you're going into the fight pretty much at 20+ charges.
With NF on the other hand you can play against Ultron virtually stun immune if you can time his phases to get unblockable. Just back off until he's holding a solid block (might be worth checking some Nightcrawler switching videos) and then beat into him with 5 combos and bait sp1s, you wouldn't debuff him after the initial two sp1s.