Replacement spring bars are plenty cheap enough, so wouldn't worry about it too much.
I don't mind leather watch straps and I have a few dress / formal watches on leather, but I tend to get very sweaty under them during the summer. My preference is for stainless steel bracelets. I've got a mix of link and expandable ones. The latter are a minefield because they're not always the most comfortable. They're commonly known as hair-pullers...
Funny, I've one no-name expandable that's super comfy, and a fix-o-flex one that's a fecking bloody nightmare. The fix-o-flex is going in the bin and will be replaced by a Milanese mesh bracelet.