yea the SH is a little bit heavier because of the ATTS itself. If you plan to do major engine mods and want to race it then the ATTS may just be a dead weight. But the ludes arent the best cars for 1/4 anyways since they are pretty much tanks with the weight of the car/H22. But if you are looking for a daily driver to mod a little bit that will have decent power than either model will be nice.