Who should i upgrade?

so i've got a duped 4* 4/45 quake and an unduped 5* rank 1 quake, should i continue to upgrade 4* or upgrade the 5* ?

Comments

My opinion only, rank the 5* to R3 and then wait for the dupe before taking to R4.

Rank your 5* Quake, she is a monster, and even unduped, she is worth the R4.