7* Skill rank up poll

My Skill 7* Roster has been my weakest up until the last few weeks. I spent a long time with only one champ - Elsa (who certainly isn’t bad but also isn’t the best skill champ). However, over the past few weeks I’ve pulled Mantis, Crossbones, and today Black Cat. And also Ronin but don’t view him at the same level as the others.
I had pretty much decided to rank up Mantis, but just had a feeling I should hold off until the Romance event and now I’m glad I did given the Black Cat pull.
So, who do you think I should rank up? I have the 6* Black Widow relic so can pop that on Black Cat. She is probably my top option now, but I do have to figure out how to play her. That said, I have been impressed with Mantis as I’ve put her through her paces, and Crossbones is also quite good even without the dup - particularly since I have Odin and Mangog at 7* to help with the fury duration problem.
From a game mode standpoint, story content is my primary priority, but I do also do enough BGs that it is worth factoring in. I get to GC most seasons.

I had pretty much decided to rank up Mantis, but just had a feeling I should hold off until the Romance event and now I’m glad I did given the Black Cat pull.
So, who do you think I should rank up? I have the 6* Black Widow relic so can pop that on Black Cat. She is probably my top option now, but I do have to figure out how to play her. That said, I have been impressed with Mantis as I’ve put her through her paces, and Crossbones is also quite good even without the dup - particularly since I have Odin and Mangog at 7* to help with the fury duration problem.
From a game mode standpoint, story content is my primary priority, but I do also do enough BGs that it is worth factoring in. I get to GC most seasons.

7* Skill rank up poll 39 votes
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Comments
I personally like Black Cat more as a champion than Mantis, but if you really enjoy both champions, I feel like Mantis would probably benefit from the rank-up more than Black Cat would.