Well done for the loss Sona... and the menu... (as a "Dukan purist", I personally wouldn't encourage eating Muller Lites too frequently, but I know people are saying they're ok so feel free to make your own decision there!)
I've only ever used fat free fromage frais in my galette. Given that it's fat free, and the cheese isn't (I don't think?), I'd go for the former any day...