One thing I was going to mention apropos of leather or metal straps. Whatever you go for if you have a decent watch you never know when a link pin will come adrift and probably lost. So, I have found it essential to carry around a small set of watch tools, namely a strap-jig and a selection of those retractable pins. Trouble is with a metal strap is there's a pin to each link, whereas a two piece strap only has two pins.

I think possible you should use a leather strap for one occasion and a metal strapped watch for yet another. I mean, you wouldn't want to go to a mate's funeral looking like a used car dealer sporting all metal- no, a nice conservative expensive leather strap would measure up. Deep sea diving and a leather strap might look out of place there.