We have not done it yet, but have it booked for March 10th. From what I understand, the differences are in charcters. CRT you may see other princesses and such. CGF I believe are Cindy and the Prince in the lobby, while suzy , perla, and fairy godmother make rounds.
CRT is a pre -plated breakfast. CGF is a buffet.
CRT is alot harder to get a ps for ( exactly 60 days out for ps). CGF so far, is much easier( I think 120 days for ps)