SMP and the T-serv are both great tires for what they are: Danged near bulletproof. It takes some serious effort to get a flat with either one of those tires. I put over 4000 miles on a pair of SMPs before I gave the bike to a friend, and he's put another 2000 miles on them. They still don't need changed! They might just be the most durable tire ever.

However, they're heavy and ride like tank treads in comparison to a lighter weight flexible tire like the Pasela TG, and you might as well just ride on the bare rims when comparing them to the Parigi-Roubaix.