Which unduped 4 Star should I rank up?

robernestleerobernestlee Member Posts: 56 ★
edited April 2018 in Strategy and Tips
So, I've gotten pretty lucky with my 4-Star crystals. Out of the 10 4-Stars I have, I've opened Archangel, Hyperion, Morningstar, Gwenpool and Guillotine. Which one of these is best to max out first?

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