We have decided on a Plugr aerator and am getting conflicting advice on 2 models. We were told that the PL400 is a heavier duty version of the PL410 which is a rental model, then we were told that the rental 410 is more robust than the 400. The only differences that I see is the 400 has a larger Honda motor 5hp vs 3.5hp, the 400 is slightly longer and doesn't fold-up as compact ( no big deal because we would roll them on and off the trailers) and the 400 has a tube frame vs the410 which has a one piece welded pan frame. I would prefer the larger motor on the 400 but it's the frame that has me confused, wouldn't the one piece pan frame be stronger and last longer than the tube frame? They are both within $100.00 of each other. Which one would you chose?