In my opinion, Scaletrax is the best choice for 3-rail track. Low profile rails, thin center rail and easy to work with flex track. Older switches like mine have some short problems with some Lionel engines with their wider rollers. To fix this I bevel the ends of the rollers using a dremel whenever I see a short permanently fixing the problem. MTH rollers have insulation on the end of the rollers for that reason. The newer ScaleTrax switches were modified to fix this and work much better. Besides that, the switches and switch machines have been working flawlessly for 11yrs. I have had Ross switches in the past and there work great, but have the larger rails which are not compatible with ScaleTrax. The wider ties spacing is not a problem for me although they could be a little closer. Another plus for me is that my MTH 2-rail engines with scale wheels work great with ScaleTrax. If I were to do it all over, I would definitely stay with ScaleTrax. Here are some photos:
