If you like a traditional view, I would suggest Lionel O Gauge Tubular.
If you want a modern hi-rail look I suggest Ross Switches and Gargraves flex track.
Search the forum, you will not find the phrase "My engine stalled on a Ross switch".
There is virtually no track geometry you cannot achieve with Ross and Gargraves. Ross has a tremendous selection of switches. And being flexible you do great things with Gargraves track.