Not only a head-to-head comparison of success rates between clinics is not meaningful because practice style and patient population affect the outcome, historic success does not guarantee future result. Furthermore your individual success is dependent on your unique circumstances. It is a big leap of faith to assume clinic xyz have a 5,10 or 20% higher success rate than clinic abc, therefore you will have 5, 10, or 20% higher chance of getting pregnant at clinic xyz than clinic abc.
At best, clinic success rate should be just one of the many factors you need to consider when you choose a fertility specialist. See: How do I choose a fertility specialist?