Call me crazy, but this is also part of my oynx vs. GMOP dilemma. I have a 20 WG MOP also, and I briefly tried on the panda with the MOP. For some reason, it didn't get my attention, so I passed. At the time, I was not really interested in the animal clips and just tried it on as my SA showed me the tray, so that might have factored into my lack of interest for the little panda guy.
Anyway, fast forward to these photos, and wow... the little panda looks so perfect hanging on oynx.

So... if I get the oynx set, I was also going to get the little panda too as part of the set. I am going to try on the panda again with my 20 WG MOP and really pay more attention, as the little guy may look fine with WG MOP. He is the only WG animal clip, so choices are limited.
I can't wait to hear you thoughts when you go to the boutique! I'm so excited for you! I am sure you'll have lots of fun!