Best portrait lens for micro four thirds?

Here is what the site says about that.

From Yongnuo YN42.5mm f/1.7M II: Yongnuo YN42.5mm f/1.7M II: A prime lens by Yongnuo for Micro Four Thirds cameras, 42mm f/1.7. A cheap autofocus portrait prime for Micro Four Thirds.

From Olympus M.Zuiko 45mm f/1.8: Olympus M.Zuiko 45mm f/1.8: A prime lens by Olympus for Micro Four Thirds cameras, 45mm f/1.8. A tiny, cheap 90mm-equivalent portrait lens.

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