Went through the same dilemma myself recently. I know you can buy both and flip one but I'm in a pretty isolated part of Australia so that's a hassle. Decided on the blue in the end because I have black gen Omega PO Chrono ceramic, black Oris gen diver, black or grey rep PAM's, black rep Breitlings............... you get the picture!
Got a ZF and after a lot of anguish over hour markers on QC pics I accepted it. Very, very happy camper. Bezel is tight, hour markers are very good (can see minor flaws through a loupe but so what) and date alignment is perfect. Looks great on the bracelet but I now mostly wear it as a weekend watch on the rubber. Looks very cool with jeans and I get quite a few comments. My Oris diver is also titanium and I really like the weight of these watches for their size. The Oris is lighter and a bigger watch but the ZF is very nice. Either way I would recommend you get one!