There are many differences between Krav Maga and BJJ, but the most important one is that Krav Maga is a self-defense system while BJJ is a grappling-based martial art. That means that BJJ doesn’t involve punches, kicks, or clinches, while Krav Maga incorporates that into its system.
In BJJ you deal with one opponent, while Krav Maga, on the other hand, has practice scenarios with multiple attackers. And those practice scenarios are what make Krav Maga the best martial art for self-defense.
In Krav Maga, you will use striking, kicks, ground game, and practice to defend yourself against some weapons.
Now, another big difference between the two is the sparring. In almost any BJJ school that you go to, you will spar regularly, while Krav Maga has occasional sparring sessions.
All of this information may make you think that BJJ is not effective as a self-defense martial art, but that is not the case. When you are up against someone who doesn’t know what to do if a fight goes to the ground, if you know Brazilian Jiu-Jitsu, you will have an enormous advantage.