Sentinel or IMIW to rank4/55?

I've seen some amazing vids on 5* Sentinel in offense but not so much about IMIW. Do you think IMIW is a good offensive champion? I want to rank either one to rank4 but can't decide, both are awaken. Thank you.
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Currently testing IMIW on offense and I can’t get him to do more than 5 plasmas