It all depends on what you want to achieve. If you are looking to build a layout with odd size curves, track that appears more prototypical, install track road ballast, and detail the layout to look more realistic, I would suggest Gargraves track and Ross switches.
If you are not going to do a lot of detail on the layout, then Lionel's Fastrack would be a good option, IMO.
I original used Real Trax on my layout. I found it very difficult to work with, and didn't like the switches.
I helped build a couple very large layouts with Fastrack and found it much easier to work with, better connections and the switches were much nicer looking, smoother operation and quitter.
