I spent a few years training in Krav Maga and it honestly taught me a lot. The studio and instructors I had were very knowledgeable in all forms. Also, they were taught from the founders of Krav Maga. I also took a few lessons in BJJ which helped me a lot with grappling and defensive actions.
I would say take krav maga (but like someone stated, find a reputable instructor). Also, take BJJ to see if you like it or not.