I have an HDR Fletcher with wool flocking. I also used to have the Advantage CC with wool flocking. I love HDR saddles. They are made my Pessoa, they are comfortable and they have a great life span. I do find you need to oil them a few times to soften up the leather, but once you do they are great.
Foam flocking wears down way too quickly though and you end up needing to reflock the saddle in a few years. So I would go for a wool flocked saddle over the foam. The foam will compress and the fit doesn't last.