What scale should models/props/sets work towards being,

Dear Blenderheads,

I am working on an advert with a client, and am stuck on which scale i should be using, so that my proportions are correct.
Which scale do you use, or which scale is widely used?

Kind Regards,

npm1

I use Metric for everything.

Moved from “General Forums > Blender and CG Discussions” to “Support > Modeling”

Metric, model to real world scales.