I generally prefer steel bracelets for my sports and tool watches (e.g., my Speedmaster Professional and SMPc) and leather bands, one black and one brown, for my dress watches (e.g., my two vintage Constellations). That’s just my preference and I don’t think there’s a need for hard and fast rules. Generally, metal bracelets are more durable than leather straps, but they are heavy (titanium excepted), scratch more easily, and don’t fit as well unless they have a micro adjustment clasp. The biggest problem with leather straps is that they are more prone to wear and tear, particularly in hot, humid climates.
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