As far as track goes I'd actually handle & look at samples of each to see what you like. Your best bet cost-wise is clearly the GG flex, though the Atlas rail height & shape is more prototypical & is my preference. You could also use the rail joiners/insulated rail joiners for power & blocking w/out any soldering or cutting. You will pay for these conveniences, though, and Atlas is currently having production issues, so you have to factor that in, too.
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