gotta completely disagree here. A tow behind will absolutaly smoke a self propelled unit with the same hp - hands down in every aspect, other then its not self propelled. They'll sweep wider, grind deeper and pound for pound just out perform a self propelled unit. Oh yeah and they cost way less. I run a 1672 and will put it up against any self propelled unit in the same hp class. The only thing Rayco has to offer that could keep up with it (self propelled) would be the rg100 which is 100 hp vs my 75.
When I worked for another tree company they used to run a 252 and a 672? tow behind vermeer, those 2 grinders would cover any job. When I went out on my own I picked up a 1625 and then the 1672. Then the new style self propelled hit the scene. I've demoed vermeers tx 50 and 60, raycos rg50, the super rg50 (65 hp turbo diesal) and the rg70, none of them would hold a candle to a 1672 and cost a whole lot more. Sure I'd love to have an rg100 but for 60g's I think the $ could be better spent elsewhere in my situation. If budget is a concern I think the best way to go is having a small self propelled and a large tow behind. Plus on bigger jobs where there's lots of stumps to grind having 2 grinders going at once is unbeatable. We've loaded up the little grinder in the bed of a 1 ton and hooked up the big grinder to get both grinders to a job with one truck.
Of course this is just my opinion based on personal experience with raycos and vermeers. Never tried a bandit grinder so can't comment on that.