I'm Greek Orthodox by baptism.
I have attended a UGCC church for a few years and attended a Byzantjne Catholic church and gone to youth retreats, pilgrimages, etc, for a couple years.
My experience is that the BCC and their people are less latinized and more zealously eastern (I e. No filioque, etc.). My experience is that the BCC is more patristic and traditionally eastern than Greek Orthodox which I found to be pretty modernized and liberal here in the USA (Elder Ephraim's athonite style monasteries excepted of course).
Also, around here (pacific northwest) all the BCC churches were founded by one man who is ultra zealous and eastern minded, which could be a contributing factor.