I'm from the Bean.
Benzino's crew, The Almighty RSO has been around since the 80s. They were putting out records when Run DMC was in their prime. But they never popped off. They made a little noise with a song called One In The Chamba that got banned because it talked about shooting cops.
Ed O.G. came out in the early 90s and had a few hit records, I Gotta Have It and Be A Father To Your Child from his first album, and a few other records.
When it's all said and done, Ed O.G. is better at rapping, but Benzino had more connections and was more thorough in the streets (from my perspective).
Here's ED O.G.'s most famous track
And here's my favorite song from the Eminem vs Benzino beef