RE: French Brittany vs English Springer
Not that this helps, but I had a brittany/springer mix for 17 years. He was a fantastic dog. Highly intelligent, wonderful disposition, and great with kids. Once a toddler, who was just learning the names to body parts, decided to demonstrate her knowledge of "eye" by touching my dog's eye over and over again. He just sat there wincing, but not moving or getting aggravated at all.
You really can't go wrong with either. But, that said, Springers have more ear infection problems than brittanys and in the past were too inbred due to their popularity.But if you are careful and get a good breeder you should be okay.
Also, brittanys have less hair so they don't need to be groomed the way a springer does a few times a year. If you don't mind the expense or maintenence then it is a moot point.