Ninety percent of the time I go to the Rotunda UC. But it sounds like the OP is flying out of the F terminal so the Amex club is closer fwiw. I recently had breakfast at the Amex club and I would have to say it was better than what I had been recently offered in at the UC but that is fairly subjective and agree a bit personal preference. Also, the Amex club had been redone since the last time I was in it so that added to the positive attitude about the Amex club.