I also have AFAA Primary Group Exercise certification, and it may depend on where you decide to work. Like Nancy, when I started teaching classes years ago, a basic certification was all you needed. Some classes that I have both designed and have been teaching for YEARS now have “specialty” certifications. Some programs are good, and some just want your money.
You may want to get your basic cert and see where it takes you—both my group exercise and personal training certs have served me very well. As Nancy mentioned, do some research on programs in your area. I am also a believer in informational interviews–you never know the connections and opportunities that may arise from them.
Good luck and welcome to the fitness industry!