Key word here for any of those mowers is MAINTENANCE. A buddy of mine had a 1999 Walker and it was a POS because he didn't maintain it. Why someone would spend 8K+ and not keep up their equipment blows my mind. I've heard the Navigator has a better hydro/engine setup. (That was a few years back) Really though its more about which one you feel more comfortable on as long as you maintain them regularly. Demo both of them.