Who to rank 3?

Dav1d4

I’m currently paragon but have completed 8.3 and just need to rank 3 to reach valiant. I can get all resources necessary to r3 two champs. Should I r3 any of my current 7* just to reach valiant or hold out until I get someone better?

Tairique_turay0

Bastion or Red Skill easily.