Through the years Ive owned, or tried and passed on, pretty much each Rolex reference. Ive had as many as eight at a time, but currently have only two. Ironically, the two youre asking about. The Daytona has always been one of their most comfortable watches, if not the most comfortable. UNTIL the OP39 came along. Theyre pretty much the same size, but the larger face on the OP39 wears better on my nearly eight inch wrist. Most complain about the bracelet and its lack of adjustment. Honestly, with an extra link, fits me perfectly. Never thought it would occur, but the OP39 gets more wrist time than the Daytona. I believe these two are the best modern Rolex references, cant go wrong with either.