...but for me there's no contest. The 312 wins in so many ways -- the date window is much nicer without the cyclops, the brushed 1950s case adds a wonderful tactile dimension, the new in-house movement is lovely with its tool watch aesthetic and IMO the dial is more pleasingly proportioned. Just my two cents. Hopefully, one of our die-hard Panerai lovers on the forum can share more insight on dimensions and comfort on the wrist of both watches being considered.
Cheers,
Daos