In terms of better or more to gen, i would say the 42mm 5th gen. Cus its has the ability to take in the whole gen bezel without modding. Unlike from the 45mm which needed some mod from Uwe aka Finedd. Take a look at Inushuk UPO thread. If you have the propensity to pick apart the bezel issue on the 45mm, then buy the 45mm.