@raccah, better croissants than Reserve?!?
No, I only tried the Reserve this past trip. That is the best croissant I have ever had - incredible, but they have a HUGE flaw, they do not last! Bought them at the Reserve and then hoped they would be good the next day for my trip home, sadly not.
The Croissant from Charles -milchig the next day is better
Now, to the USA-based locations, I would say that until The Reserve the San Diego bakery and the bakery right next to the FLL airport have the best Croissants. I have not been to New Orleans, but I hear that is really good too.
Still, those two USA locations are solid, not as good as The Reserve, but better than Charles - milchig. Another good option in Paris, especially for 1+ day, is Sams, solid