Bennett, another guy who can comment on this with some experience is @Choo Choo Charlie. In his layout photos, he uses the older all metal Marx switches and also runs a wide variety of trains. I noticed that's what he uses from his photos because he paints them grey to match his track roadbed: A nice touch in my estimation.
I personally have used Marx 027 switches in the past. The metal ones for me worked fine, but as others mentioned above, the plastic ones were problematic for me, even with more modern kinds of engines.
I opted for the Lionel MPC era type of 027 turnouts, because of the design of the switch box housing lever, I can drill a small hole in that lever and operate manual switches via nylon fishline, so I can "mimic" an automatic switch track without the drawbacks of the electric Lionel 027 version.