The CE units that bisect the floor pan are the strongest because of the way they dived the floor and integrate it into the structure. The contoured connectors are next in line because they add needed reinforcement, but do not put the floor pan in a shear plane like the CE units. The MP units are the least strong of the three because they do none of the above, but they are a HUGE step up from having nothing. They also are the easiest to install or uninstall should you ever want to get rid of them.