Science rank up

I have some 2-3 rank up gems expiring, plus a 3-4 rank up in the stash, and the end goal to eventually R5... so who should get it?
Mostly looking for help to finish and complete act 6, as well as completion for some variants. My only maxed science champs are Cap and Rulk. I also have some AGs I could use too!
Mostly looking for help to finish and complete act 6, as well as completion for some variants. My only maxed science champs are Cap and Rulk. I also have some AGs I could use too!
Science rank up 15 votes
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Comments
Definitely IBom. The usage he has in more recent content has been insane. Arguably a top 5 science