Which Watch?
Down to the individual, of course. In my case I opted for an analogue watch with a black face and white luminous hands. Easy to read under all conditions. And a rotating bezel. I find it very convenient to just move the bezel to line up with the minute hand and then just read off the actual time at the next check point. It is a resin cased example and is still working fine some 10 years later. Battery life is about 3 years. Now there is probably a solar powered version available. Accuracy is about 5 seconds a month - good enough!
I would certainly endorse all the 'don't buy a fancy pilot watch' comments and become a poser...
RF