Hi there. I am at the state where I must decide whos my first rank 5. Help me with this decision please

We have 4 candidates: Venom, Cap IW, Claire and Domino

the rest of my 5 star roster

Domino has trinity, but only as a 4 star
Cap is 80ish Sig
Venom and Claire are my favorites

Aside from 5 stars I use 4 star maxed out Doom, Stealthy, Ghost and Guilly 2099 + 6 star rank 1 VTD. I thought about R2 him but I don't think it's smart since I have no R5 5 stars and will lose t5b here
I am newly Cavalier, explored act 5 aside from Collector quest. I am able to complete Aarkus Herald quest with Doom and Claire. Completed chapter 1 of variant 3, stucked in quest 3 of Variant 2 (poison one).
I think this way: rank up someone who'll help me to complete variants and get more resources for other rank-ups. Also Id like to explore collector quest since it'll give me t5b for one more rank-up, but i think with enough units it's doable with any of this champs.
Arguments for Venom: he's good for V5 and V2, he doesn't need awakened ability.
Arguments for Claire: she's good for a lot of matchups, her immunities are insane, she's good for V5 and doesn't need awakened ability
Arguments for Domino: insane damage, will help me go through V2. I tried poison quest with her (trinity + Fury + deadpool for purifying first poison), but R4 damage isn't enough. I think R5 will be enough for that.
Arguments for Cap: he's good for V2, most non-stun immune matchups are cheesy for him. Good block prof. He's awakened, so if I pull 6 star Cap, I'll use 5 star anyway. I can't say the same about Venom, Claire and Domino: if I pull them as a 6 star soon after ranking them up, I'll be very sad

As u see, It's very tough decision for me. Help me out please