The vast majority of tabletop gaming miniatures are in the 28-35mm scale. This includes games like Warhammer 40k, Infinity the Game, Bolt Action, and many more.
Of course, for a truly fun miniature painting experience, larger scales allow you to experiment more easily with other techniques. Painting techniques like airbrushing and wet-blending are easier to learn on large model surfaces.
In this case, painting miniatures with oil paints is another method that is also more approachable with larger models.
Judgement miniatures are a perfect example of models that are well suited for experimenting with new mediums, especially with their larger 54mm scale size.