I have used both + a front mount spring tine that I currently use on my Walker. The verticle mowers that you are talking about do a nice job on small lots but they are pretty aggressive to the turf. <br>The tow behind is o.k but slow when you come to a sidewalk you have to talk it off or raise it up and that could be a pain. also they require weight. I have the option of dethatching and picking up at the same TINE
sorry, time if I want to. Its a personal choice but remember Time is Money in this business but the fastest guy doesn't always do quality work. Good Luck.