We sell only leather saddles, and for now, only Brooks ones. More about our selection here. There have been other leather saddles, but success has been mixed. Brooks are consistent and really good. But leather isn’t the only way to go. In some areas, leather saddles get stolen. A thief may take your whole bike for its saddle. And leather saddles, despite what you wish were true, despite what some riders have said, do not last as long or weather as well as saddles formed over a plasticky base. Leather, with air below it and a stout rider on top of it, can sag—especially when it gets wet with buttsweat or rain. There are preventative measures you can take before that happens, and after-the fact solutions that can wrestle it back into good form, but a leather saddle requires better care, and even then won’t last as long as a well-made saddle supported by a plasticky shell.
Shape beats material. You want the saddle to be wide enough to support your sit bones (for most rides, that’s 165mm at least), and flat where you sit. The middle of the saddle, btw the nose and back, should be lower than the back, or cut out, to reduce pressure on your penile artery or labia folds. Either way (lower or cut-out) will work, and you just have to find one that works.