The silicone is MUCH nicer than the leather.
The silicone has an amazing feel to it and if you've never touched one, you'll be like 'wow'.
The silicone also is lined entirely on the inside, the leather is not lined on the sides which is lame. The leather also gets nasty looking IMO. "Patina" it is not. It's just nasty dirt and grime where you hold it which is disgusting to me personally.
As for the corners peeling, neither me nor my wife have ever experienced this. What are you guys doing, using fingernails at the corners to pry these cases off? You don't need to touch the corners at all to remove the case, you can just use the broad side of your thumb along the side near the lower corner of the screen and it slides off nice and easy without any corner damage.
Had both over the years and silicone >>>> leather