Rank up 4 or 5 star?

Chalibra

I have a 4 star R4 awakened Ghost Rider and i just pulled a 5-star Ghost Rider (unawakened). Should i use my T4CC to max out my 4 star or should i use it to get my 5 star to rank 3?

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Rank the 5* ghost rider

binrak

Use it on 5 star Ghost rider