As above, personal preference, but I find the layout mounted switch controllers near the switches to be very handy. I started out several years ago and was going to use an AIU for my switches. Ended up just installing the switch controllers on the layout and decided I liked them that way. AIU is coming eventually for routes and things, but still not yet installed on the layout. I find myself walking around while running trains so it works out good for me to have the local controls. I have DCS and Legacy only, no conventional.
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