What are the signs of a good rooster to you.

I have 4 roosters and I will be getting rid of 2, but before I do, I want to know what signs to look for in a rooster that is a keeper?

I think this comes to personal preference, but I am curious what makes a good rooster in your eyes? Or what makes a bad rooster in your eyes thats worth removing from the flock? Any tips on what helps you decide?