In my experience, there never seems to be an AMP that is better than the next. What you will find is each spot tends to have its super star, and the rest just blend in.
I think that is natural because too many super stars in one place can become an issue. With one star the rest get the left overs, lol.
Don't forget, some AMP's are owned by the same people so they might intentionally spread their good ladies around to be sure to mix it up.