Hi,
When I got my pointer he was on beta puppy but found he was pooing loads, so I wasn't sure how much good he was getting out of it, so we switched to eukanuba and found it really good, well worth paying the extra, after all its only like a tenner a bag more. He stayed on it till about 9 months and now hes on skinners field and trial which is really good too. Definately recommend the eukanuba though, he's always had a good coat and healthy gut etc, but you can only try it.
Hope that helps