Should I focus on ranking up an unawakened venom or an awakened cull obsidian for act 6?

LOGAN1738

They're both 5 stars, and I have a rank 2 to 3 and a rank 3 to 4 cosmic gem that i got from completing variant 3. Any tips or advice on either of the characters is welcome as well!

LOGAN1738

LOGAN1738

Here’s my 5 star roster, I plan on ranking up quake and sparky, maybe longshot as well

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manveerthereal

Cull