As background, when the Aquanaut was first introduced in the 1990s for me it was definitely not love at first sight ….. far from. But over a period of many years I went from indifference to appreciation to love.
It took me quite a while to acquire each of these watches after the individual decisions were made, but eventually it happened.
The 5168 while 42.2 mm like the 5968, is much much thinner (8.25mm to 11.9). Although made of gold, subjectively speaking the 5168 wears lighter. I like that nothing protrudes from the case other than the crown. I like that the date is set from the crown. There is no need for a setting pin (which creates the possibility of scratching the watch) and is simpler and easier IMO to set. While both 42.2 mm watches are large for my 16.5 cm / 6.5” wrist I like the large size which goes with the military style. I love the vibrant khaki green hue which is much brighter and for me more beautiful than the green dial color on Nautilus and Cubitus. I like that it is a sweep seconds.
The 5968A is a big watch n every way but I am ok with that. A lot of presence on the wrist. Wears substantially larger than 5168. Tried the gold versions - beautiful but a bit much for me, especially the weight on my small wrist. I love the flyback chrono feature which in effect allows it to be set to the second, somewhat like a stop seconds feature. Also that the chrono can be run continuously as a seconds hand with no damage to the movement because of the vertical clutch system. I love that it is a chrono, although it would be even better if the chronograph function could be run from the crown. The case would be better proportioned IMO. I know that would be a drastic, expensive and unnecessary change … but one can dream. I love it with the orange strap, but it draws a lot of attention if worn with a short sleeve shirt, so I avoid doing that generally. One can also use the black strap option which is appealing in its own way.
Ok, so you are probably thinking, enough words, which do I prefer? I would like to be able to answer that truthfully by choosing. But that would not be truthful. At least at this point in time I don’t love one more than the other. Perhaps over time since I generally gravitate to complicated watches, I will favor the chrono. But I love the vibrant color, simplicity and significantly more comfortable fit of the 5168. So I guess the bottom line is that I consider myself to be very fortunate to own both and to not need to choose one over the other.
I will be interested in reading your thoughts, from those who own both, one or neither - and whether lovers, haters or anything in between.
Best, Patekova