What size face do you wear and prefer most? I have 31mm (mid-size rolex), 33mm and 38mm (J12s) and 34mm (rolex air king) and also a roadster and others. Only qualm I'm having about the ballon bleu today is its face size - 36 mm for the medium. I'm hesitant about another larger face. The small ballon bleu is a 29 mm. But all SAs and friends tell me the medium is the best for me. I'm 5ft6 and 1/2 and 118 lbs.