I looked at both machines hard but I decided on the LX 565 for a couple reasons. First of which is the 555 is getting to be an old machine, no way around that. It's a good one, but age is starting to creep up on it, and a lot of the parts are going to be unobtainium or very expensive. I also didn't like that the hydraulics and drive share a common reservoir in the 555. Too much opportunity to make metal in the oil. Second, the boom is much stouter on the LX, but you still need to be wary of cracks around the rear pivot points. The cab also felt larger and more comfortable. The LS was nice, but too spendy for me for a part-time farm machine. If I want to trade up later, I think the LX will hold value better than the L machine too. Thought the 555 has Kubota power, the engine in the LX seems just as stout and bulletprooof as the Kubota's I've owned. YMMV