Data objects, ISO standards

Hi community!

I am new to Pimcore development and one data model design question bothers me.

If we take for example one product, having a standard ISO 123, what benefits, or potential issues would there be to have the standards as data objects?

What difference would it make to have a standard, like the ISO and under that, all the ISO numbers as a data object?

For example:
ISO
–> ISO 123 (this data object would be linked to the product)

OR:
ISO
–> ISO 123
– --> ISO 123 variant A (This, very exact data object would be linked to the product)

OR:
Just having a field in the product, when there would not be any relations.