Deciding on my first AP

[futobuta]

Hey guys,
I am contemplating on which model to get as my first AP. Two models I'm considering now is the 15500 grey and the black 15710 diver. Plan to use it regularly. My job does not permit me to wear watches during work. So basically the watch is only on my during my journey to and from work. I'm weight each models' pros n cons. Which one do you guys think is better, in terms of durability, robustness.... and value retention. Appreciate your honest opinion.