Where I live dictates that flat protection be at the top of the features list. I've ridden a Marathon to destruction. 4 Pasela TGs looked like they lost a series of knife fights. Where I live, Kevlar belted tires are mandatory as are Mr Tuffy tire liners for me. The Pasela TGs had papery thin sidewalls that were eaisily sliced.

My current experiment is the WalMart Roadbike Tire. I had to buy one to find out the size, 700c x 35. It wasn't printed on the box, just a range from 32mm - 45mm.

I bought them knowing the info on the box was going to be somewhat optimistic. These are more like heavy industrial city tires. They have very thick tread and sidewalls. I can remove them and replace them on "my wheels" with my bare hands. This is exactly the kind of tire I am forced to use under my enviromental conditions. So far, very low mileage but, with 0 flats.

Yes, some tires are more prone to flatting. My Marathon was excellent so long as I pulled out the glass before it was eventually driven into the tube. The Paselas were great handling but fragile by comparison to the Marathon.