Leather...When given the choice of leather or fabric upholstery I prefer to sit on, the answer has always been fabric. My main chair is fabric but one of my office chairs is covered in a man made Ultrasuede. Usually, I drape a towel over the Ultrasuede so it doesn't show signs of wear. Leather seating from experience, is usually stiffer than fabric and I'd guess it's because of longevity. Leather tends to stretch and pucker.
Last month when I needed a rental car, a got a Mazda SUV with leather seats. Yeah, uncomfortable as I imagined despite all the motorized adjustments possible.
The one thing people mention about leather is the smell. There's a mystique about processed animal hide that people are attracted to. Maybe having leather goods is a sign of wealth? I don't know.
We were at Ikea last weekend and on my shopping list was a chair. I must have tried 20 and one high-back fabric style was my top choice. They also offered a leather cushion version for $100 more. Decisions, decisions... back & forth trying the fabric versus the leather, there was a bit of Deja vu... the leather smell reminded me of a baseball glove I had as a kid.
I bought the one with black leather.