I have about 80ft of exterior stairs with two landings to which I want to add three zones of low-voltage lights. I would like a 3-way switch controlling each zone at the top and the bottom of the zone. I believe I could use one transformer and run low-voltage wire to all my switches however, I am having a hard time finding appropriate exterior switches and the equivalent of 3-wire wet-location low voltage wire.
My 120V brain says to just use UF-B 120V wiring and wet location switches/boxes that then feed three separate GFCI outlets into which I plug three separate transformers. The expensive part of the project are the lights so paying more for UF-B 14/3 or 12/3, for instance, appears nominal.
I'm using 12guage and a 20amp GFCI breaker wire in the example in case I need to use the outlet for electrical tools in the future. Other than having to buy three transformers instead of one, what are the benefits of a all low-voltage system over what I am proposing?
This is the only DC wall switch I can find: Leviton 12021-2I (SPST)