I'd go Venom, but in case you're curious, I R3'ed my Cull for TB and he is a lot of fun. Impractical in my instances but his passive damage is soooo crazy!
I took Venom to r3 as my second cosmic, ahead of Corvus and CMM and no regrets whatsoever. Now that I have a 6* r3 Fury I'll rank CMM next but I'll still use Venom more.
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And well useful too.
But really cool. Lol.
But may be awknning is an issue.
Go for it.