Danzan ryu jujitsu typically doesn't have "danzan ryu" competitions. They just go to the local judo competitions. The level of randori in your local danzan ryu school is a matter of where you're at. That's one of the biggest drawbacks of danzan ryu- some schools don't like the idea of resistance and randori.
So, the question is, where are you at, and what danzan ryu school are you looking at attending? That will help answer your question of what you can expect in the way of competition.