Leather is cold in the winter and sticky in the summer.

I got a leather sofa because I thought it would be the best choice with a dog in the house (although he did not go on the furniture, the fur gets everywhere). It was great as far as the fur situation went, but it was cold to sit on when the house temp was cool so no more leather sofas for me - the next sofa was microfiber. Still good as far as dog hair goes but never cold.

Both. I prefer to mix it up and have a bit of every type of texture. If the couch is leather, then fabric accent chair. If the couch is fabric, then leather accent chair.

Leather is easy to clean and doesn't harbor dust mites. Good if you have allergies.

For sure genuine leather furniture. So much easier to clean!

I like to combine leather and fabric as well. There is nothing wrong with leather but sadly, I find that a lot of people opt for leather because it seems like an easy choice to make over trying to figure out what fabric to select. For me, a room with too much leather lacks warmth.