I like Mitsio for reasons stated previously - they are more original. The Faly are nice and they are rare, but once they become common they'll be mislabeled as Nosy Be or blue bar Ambanjas by pet stores and wholesalers. Mitsios are hard to mistake and I like them simply due to the uniqueness factor.
I just ordered a pair today! Can't wait for them.
I've also found that in all these threads comparing locales, the people who go with the blue ones, their reason is often 'blue is my favorite color'
The beauty of chams is that they are like colors, and you can have a favorite and that's just the way it is; never let popular opinion swing your votes.