Gracie Academy teaches original , self-defense oriented Brazilian Jiu Jitsu. It is pretty much as old school and real life oriented as pure jiu jitsu can be.
Gracie Barra is a very good sport jiu jitsu gym.
You will see a big difference in what you will learn in the beginning. At GA you will probably begin with lessons on basic takedowns, basic submissions, things you can and will use in real life.
For sports BJJ you will probably start by learning also some basic things but more to be used in sport BJJ.
There is absolutely no reason to believe that Gracie Academy is weak in sports BJJ, Rorion, Ralek, Ryron, Rener, have worn a gi and rolled their whole lives. They are very, good.