The title really says it all. I am looking into a hamilton jazzmaster and I am torn between the leather strap and the metal strap. I am wondering which would be the best fit and why. I work in the technology field, and dress can range from semi formal to semi casual. When do you prefer a leather over metal, and what kind / color of leather is your favorite. Thanks. p.s. is this band waterproof at all? If I am washing my hands with the watch on, will it hurt or ruin the band?