IMO when planning a layout there are top level personal expectations of functionality, realism and layout. For example, do you expect your trains to creep along effortlessly and/or run more than one train at a time ? Are you hi-rail, tin plate or somewhere in-between ? Track radius, switching, sidings, round house, yards, etc to fit the space need envisioning. Are you running a railroad, entertaining the Grandkids or maybe point to point ? Once you have an idea of what you would like to do, more practical considerations such as skill level, cost and time investment will help focus your track system selection. In summary specification comes before material selection.
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