The one on the left is according to standard. The standard was modified several times so it would correspond to the Poodle type on the right.
The dog on the left still exists, but it is near extinction. The one on the right is rather rare, but as one says, needs to be vulgarisé, understrand make more and sell more. Nothing to do with selection but sales.
Have you seen ever the one on the right as a working gundog or “chien de chasse”?
More coming which you are going to really enjoy!