RMEs have lower Base DMG which means lower WS DMG, but they are much better for TP DMG due to the ODD & such which pushes them above other options in many cases from what I know. I don't know exactly what you're comparing nor if it fits in this case but if you're looking at only WS DMG than you're judging the weapon to be worse on the worst aspect of the weapon by compare to the other non-RME weapons.