We have been to SCC 5 times now and we are usually able to be on a small boat with just 6 divers and DM, all experienced. We discuss with our DM what we want to do and make a plan. Sometimes they want us to go to a certain site as another boat is going where we request, but they always accomodate us with our requests overall. We love the DMs and dive op, love that they have big camera tables and you can walk around on boat.
We used to dive regularly with someone else, small 6-pack boats and the beating you take bouncing on those along with holding a camera in your lap just was not good for me. I seriously prefer SCC boats and dive ops to all 5 dive ops we have used in Cozumel (we have been going there for 18 years to dive).
As far as SCC being a cattleboat, I disagree. They do have 3 larger boats, but usually only 2 groups of 8 with 2 DMs will be on them, and the groups are usually all friends from back home, so they want to be on same boat. As I said, when we go, we are usually on one of the 8-pack boats.