>>2438035very hit or miss, good when good. leather is pretty waterproof AS A MATERIAL, but the physical construction of the boot has to be designed to be decently waterproof as well. depending on how they are constructed they either keep you dry or leak like a sieve. i see a lot of leather boots with shittily gusseted tongues to lower costs too so look out for that.
your question is more leather vs canvas material shit, than your question is leather vs goretex. goretex is just a breathable waterproof membrane, theres leather boots with it too.
leather is more physically protective and way less breathable, when we're comparing good boots to good boots. leather's way harder to make a boot actually waterproof so you have to be more careful choosing them.