I prefer Ryan. I think it is the best for uneven terrain, pretty durable, easy to operate. Classens sod cutter would be a close second. Bluebird is the worst I've used. The blade is behind the rear wheels. if there are undulations in the ground it leaves skips. Turfco KisCutter is OK but like most Turfco equipment it's not built heavy enough to take the abuse that other manufacturer's equipment can. You get what you pay for.