When I was looking at tires (26 x 1.5), thought process went:

Panaracer T-Serv: light, but not the best puncture protection
Schwalbe Marathon: Heavy, but great puncture protection

The Panaracer RiBMo fell right in between the other two offerings, weight wise, and have proved more puncture protective than the T-Servs, but not at the weight penalty of the Marathons.