best choice
I have ATS and have nothing but good to say about the product and their service. It is so good I have almost forgotten I really wanted a manual someday!
As has been stated here many times, and rightly so, all the products mentioned are good - much better than stock. I think the best answer is one Tom McCayhill (I am sure I miss-spelled his name) from Mechanics Illustrated once said many years ago. When asked "what is better, Ford or Chevy?" his response was simply "yes". For those of you who are older, you will likely remember Tom and his articles in Mechanics Illustrated. Very knowledgable, but mixed with humor. Another good one was when asked the best way to rotate tires, he said "start the car, put it in gear and step on the gas - with any luck your tires will rotate! Quite a character he was.
Paul H