Feedback on Calculator Project: bootstrap version or material-design version?

Feedback on Calculator Project: bootstrap version or material-design version?
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#1

I made two versions of my calculator project: a material-design style calculator(using Google’s mdl css framework), and a bootstrap calculator.

Persoanally, I think bootstrap is too common looking, thus a bit boring; while material design is fresh and bold. What do you think? Which should I use as my finished FCC Calculator project?
-Ben