I've owned both gens and currently have the 45mm PO on bracelet. The PO is a superior watch based on the specs, but the SMP isn't all that far behind. I think it's really a personal choice based on the design and asthetics of the two. The blue dialed SMP is/was one of the most comfortable, go anywhere, do anything, tool watches I've ever had. I'm sure the PO can do the same, but I haven't had the same amount of experience with her. If money isn't a concern I'd say go for the PO. If you want to stick with the classic Seamaster design for with the SMP. Good luck and you really can't loose with either.