Frank,
Like many others I use Ross switches and Gargraves track.
I found that it's easier to use sectional curved track to start and end a curve, then to use flex track for all of it, especially if it's a transitional curve. I have 4 corners of my layout that are a constant radius, all of that is using sectional curved pieces. I use the long flex track for sidings where I have fairly long straight tracks. The track can easily be cut using a Dremel cut-off disk, I use those big 1-1/2" or so disks.
With that said I saw one of our fellow forumites layout and he used all Atlas track. Very nice looking track system they have and he said he didn't have any/many problems with it.
Of course the less number of joints you have the smoother the train should run, but I do like hearing the clickety-clack of the train as it crosses the joints.
All my switches are manually thrown using Caboose Industries Ground Throws, but I did use the Z-Stuff machines on my old layout and had no problems.
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