Hmm, that's a tricky question which is why I suppose I ended up with both. The Gen2 probably edges it, but only just. I like the fact that the Gen1 is the original and prefer the blue backlight of the 1666A module. The brushed bezel and pushers of the Gen2 are more subtle than the earlier polished versions but I prefer the overall bezel design of the Gen1. I love the unusual crown of the Gen2 and it's nice to have the caseback engraving and thermocompensated movement. There are enough differences for me to convince myself that it is okay to have the pair, and I keep the earlier version on Kevlar and the newer one on the bracelet for added variety.