@paulp575 posted:This is a one-time purchase.
I am using Lionel's FasTrack
Since you have FastTrack already, I would say go with the MTH RealTrax. I would assume that you want to keep the "theme" of track with pre-made beds. I have RealTrax for my layout (which includes a trolley line) and have not had a problem with it the past 14 years *Knock on wood.*
Bryce