Sorry, I liked the 49ers with Rice and Montana growing up. St. Louis didn't have a team so I watched other teams. Ever since the Rams moved to St. Louis, there really hasn't been much of a rivalry until just recently. I do hate Krapernick and Coach Blowhardbaugh, though.
As for the Saints, I've always hated them. Not a fan of Brees or the fans. Don't care for the city much, either. The St. Louis Rams had a better rivalry with the Saints in its hay day than the 9ers.