Which 5* to rank next?

gggg00

I’ve been lucky overall with my 5* pulls (much better than my 6*s so far). Which champ should I focus on next for rank ups? I’ve 100% Act 5 and am starting Variants. Thanks for any suggestions!

AssumedName

It’s between stryfe, guilly and prof x really.

I just don’t like guilly so take that as you will. And then between prof x and stryfe it could go to either. Up to you honestly.