My great room has leather, we're on a second set, first lasted over 12 years with our other dog, BIG who loved to curl up on it. We replaced it and have another dog, smaller but he too, loved it and we allow him on it.
IMHO, they wear really well if you buy a good quality leather, and we chose to go all leather versus vinyl in parts. It "wears" like an old pair of leather boots, getting softer and softer, there are different grades actually, some being so soft to start with that they will mar, scrape evn scratch easily, so we did Not choose that. they come in all colors (we're more of a natural rustic/country look) and we LOVE them.
My only regret was that I should have also bought leather for the living room, I hate cleaning the couches (cotton?) which get icky and I actually cover them. So, for us, leather has worked well, with family pets and Holiday spills etc. Oh as far as "cold" yes it does feel cool till you warm it up, but in the summer warm mos, it more than makes up for that
Good Luck deciding, we bought local and the prices really due vary, search around consider shipping rather than retail.
Good Luck OP!
Oh, one of our rooms has micro fiber i could SCREAM about that, seriously....worse thing we ever bought and it is going to trash when I get around to it.....it gets pilly somewhat and the wear is awful....