I've never had a useable version of warlock, but whenever I used cmm significantly as a 4* throughout act 4-act 5.2.6. However, I got corvus as a 4* a month after I got uncollected and used him significantly for AQ and monthly uncollected EQ. I am only telling you this because corvus and cmm are both extremely viable champions. To pick between the two you need to have a certain playstyle. What I mean by that, is corvus has more of a passive play style because after his glaive charges have been used up his damage output drops. On the other hand cmm has a more aggressive playstyle since once she enters binary ignition you want to deal as much damage as possible before her charges expire. Another thing that can be a determining factor is the content that you are trying to clear, maybe someone else could provide more insight than I can but id recommend either corvus or cmm.
Corvus or Warlock. Warlock has insane utility and the ability to tank certain hits, with insane damage, but Corvus has insane damage and a very good evade/auto block counter. Pick your present M8
I wish I had a useable warlock, I've only heard good things about him.
Warlock is fantastic, I’ve found him useful in practically every part of the game. From high tier AW, up to map 6 AQ, every quest I’ve done in act 6 and several of the variants.
Your other options are great too so there isn’t a wrong answer really.
I feel like this is super dependent on where you are at in content. I would say Warlock for general content and if you still have Variants (2 and 3) to explore or complete. Corvus maybe if you're running suicides. I wouldn't rank up a Cmm to r2 over the others simply because of the extra rank up material cost.
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Your other options are great too so there isn’t a wrong answer really.