Hey Guys and Gals

Forgive my ignorance in regards to this basic question...

I have a small leak in one of my run flat tires on my 2009 X5 (19inch wheels).
Not sure where the leak is, but I'm hoping it can be repaired.

Question: In your experience-is it better to go to the BMW dealer for this task or an independent dealer (Bridgestone etc) that is certified to work on run flat tires?

Thanks in advance--you guys are great!