Some of the Gracies (*cough* Rorion *cough*) would like you to believe that there is only one "real" jiujitsu -- Gracie Jiujitsu, and everything else is an inferior clone.
This is patently ridiculous on the basis that things that work, work, regardless of what they are called.
Rorion may have an argument that a lot of jiu-jitsu schools overemphasize "sport jiujitsu" and underemphasize "self defence applications of jiujitsu", but this is something that is going to differ school by school, and there are probably many non-gracie schools that have a greater emphasis on "self defence applications" than a gracie school.
Historically however, a lot of the Gracie schools have been seen to be a little more "dogmatic" in their teaching of jiujitsu, whereas most non-Gracie's will have a more open mind. The basic question is this, if you had a choice between going to a doctor from 1910 or 2010, where would you go? Similarly, if you want to learn ground fighting from someone in 1910 or 2010, where would you go?
Also, if the school you're going to is not rolling on a regular basis (re: every class), it should not be classified as brazilian jiujitsu period.