Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

I cannot suggest which gauge is better, but I went with O-gauge (32mm) as I have about a dozen or so 100 year old Bings, Märklin, and Carette locos, along with my Bowmans and Mamods that are all O-gauge. When I someday get an outdoor layout going I am going to use dual-gauge track from Sunset Valley Railroad so I can also run G-gauge (45mm).

https://www.sunsetvalleyrailroad.com/track---rail.html