In contrast, in the marketplace, everyone chooses for themselves. If you want to model in a scale or historical period different from what most people are modeling, you can do it. You aren't required to conform to the majorities' vote. There are no perfect scales to always use. Each one has its advantages and disadvantages.
None is right for everyone, or for every occasion.
That's why there is no best scale. One size doesn't fit all. Same goes for cars, computers, houses, pets, clothes, etc. This is for experienced modelers who want a challenge, like to scratch-build, and love mountain scenery. Although Narrow Gauge is currently a small segment of the modeling community, don't let that stop you if it appeals to you.