Need advice

Hello. I am going to be new to MFT in the next couple of weeks by purchasing a OMD. I have been reading everyone's comments on lenses and appreciate the insight. I have been buying used MFT lenses and have come upon a unique opportunity.

I can get the Oly 9-18 or the panny 7-14 for the same, low price. Size aside, which one has better optical clarity? From those of you that have both or used both, which on do you prefer and why?

Your insight would be a huge help.

Matt