I presume most 2 rail O modellers choose it because of animosity for the unrealistic 3rd-rail. Otherwise, 3-rail scale has it's advantages. I've seen 3-railers with HO middle rails to reduce the obviousness of it. Certainly way more equipment is available in 3-rail. You can still have big curves.
It continues to suprise me that S scale isn't more popular. It seems like O 2-rail and S scale are at odds with one another - neither particularly successful - and both fighting over the same group of heft desiring 2-rail realists. 
I've gone back and forth with S and O 2-rail and the problem is O 2-rail is just so big. Both scales are dependent on the production of non-scale models - 3-rail O or AF.
As to the OP, if it's about running trains in a circle, the world is your oyster. That's the market share of model railroading. You'll never be want for options. The moment you start having to have everything in scale, it is a slippery slope with no good answers.
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