Scale Units in a miniture game world.

This is a hypothetical question about developing a product in Unreal (5.2) that is not at a real-world scale. For example, if i were building a game where you control a toy soldier in a human world (toy store), would it make more sense to have

  1. the toy soldiers at a human scale (170cm/units tall) and then build the environment at a much larger scale relative to the soldier.

  2. Alternatively to build the environment at a real-world unit scale, and then have small characters within it ie (6cm tall).

I know it dosnt really matter either way, but Unreal calculates some variables like physics and lighting at a real-world scale under the hood as i understand and some of these calculations can’t be changed, so i would have to use very big numbers / very small number depending which route i go?

As an FYI we are building all our own rigs and animations so we can do either in Maya / Max etc… We are not planning to use any marketplace assets so their scale is not important. We are planning to use full RTX and Niagra etc though which may or may not be scene scale dependent.

Thoughts?