I find the quantification of very emotional topics not very helpfull in the long run:

What counts as “10% better”?

Do you know if the number, should it even exist, stays consistent? Or that you got the “correct one”?

My advice:

Find out what you seek out in a relathionship, what you want to avoid, and then talk about it.

Because “10% better” could just mean the other guy is driving more carefull with the family-car, doesnt chew with an open mouth or shaves more often.