What is best for a primary key? Bigint of 20 numbers or varchar / varbinary of 15 characters?
Bignint is much faster than cvarchar or varbinary. at anbay time..
And so you can have 18446744073709551615 (unsigned) Rows.
You would use uuids, when you enter data in different databases and try to unite them.
but if you only need unique ids, use bigint.