I have both and use them in different ways. Yes, a tooth bar will grab brush well but it won't rip all the undergrowth at the same time like a ratchet rake will. The ratchet rake is used in both forward and reverse movement. Forward, you have your FEL level to the ground and the smaller teeth are ripping the ground while the larger teeth is ripping up the brush. After you make the forward pass, you lift your FEL over the crap you just ripped up and angle your FEL downwards with both sets of teeth touching the ground. While back dragging you move the stuff you just loosened up and rip what may have been missed in the forward pass.