Well .... If you are going to be putting the track together and taking it apart often. Tubular track is definitely the way to go. It is so rugged, and minor issues can be repaired with a needle nose pliers.
If you are going to set the track up basically once on a fixed layout it is a different story. the tubular high rail just looks so, so, toylike. For a Christmas layout sometimes that is the look that I want. But if I was doing a permanent model train set up I would not use it.
I got the Fastrack with a set and used it a couple years, but developed a dislike for it. Its been so long now I don't remember exactly why.
Personally I mostly use the Atlas Century track line. It looks better than any of the Lionel, MTH, Gargraves lines. It does have the issue of not liking to be put together and taken apart frequently as there are 3 rail joiners on each connection. The joiners become weaker with each connection and continually tightening them is a chore ( I still use it for most of my Christmas stuff and live with that affliction. I had to have three feeders on my outside loop last christmas because of weak rail joiners). It is also EXPEN$IVE. Oh, and avoid the Atlas Industrial track line. It uses square wire for joiners that like to fall out, and they do not carry electricity well, and there are very limited options on the size and types of track pieces.
Below is an Atlas curve chart, they are different than Lionels. Below that is my Christmas Loops from last year. Outside is O-72, with a couple O-81. Middle loop are O-63, and inside is O-54. You can see all the rail joiners involved.
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