Hi Bobbie,

It is a very interesting topic. Since it has been a question for me too somehow, I have just done a small test as below.
- Creating one entry with 3 terms in French (one-to-three)
- Creating three entries for each pair (one-to-one)

As the screenshot shows, there is no big different on BWB.

However in Studio, it looks different as below.

Either way, the term recognition could work correctly. So I think there is no big difference in those two styles so far, but some considerations as I wrote below.
When I tried to create the three entries in one-to-one style, I was prompted by a warning by WorldServer as:
    This term has previously been proposed: associate(Approved)
Because of this warning, I can assume WorldServer is expecting terms are created in one-to-multi style.

Another consideration is, when you work with Excel files for the terms by exporting and importing.
If you are collecting new terms in your local Excel file, and you import it to WorldServer sometimes, we should carefully determine which style is the best.
If you export one-to-multi style in "Delimited File: Simple Format", it will be a CSV as below, that means you need to create your Excel in a same manner.

For one-to-one style, it will be:

So I think one-to-one style might be handy for us, when we need to think about import/export.

Of course, there are some other considerations like in case of using attributes, TD Groups, etc.

Best,
Taiki