I have an LX4 rotary cutter and love it. I am amazed at the amount of tall grass this machine will handle. I do run with my FEL on to give a little extra weight on the front for steering and in real tall grass (three foot and taller) I run the loader bucket about a foot off the ground to push the grass in the direction of travel. This prevents tall grass from getting into the cooling fan on the hydro. I am sure that the performance on the LX4 would be comparable to the two models you mentioned.