Blues is a small club compared to Surf and back in the day, a coach (example the Baker brothers) would start with a team at the youngest level and take them all the way until they age out. I'm sure at Surf, the olders coaches just stick to their age group. It makes sense that Surf would be able to consistently increase their talent consolidation as you move up age groups, whereas Blues has always had one or two unbeatable teams in a specific age group which stick together until the end of their youth soccer run.
The Baker 01's and 02's were probably the most dominant youth teams ever assembled. I think they went like 3 years without a loss at one point. My kid was an '02 and played one of her greatest games against them her junior year and held them scoreless (we parked the bus in front of the goal that game for sure). They played very direct, as I recall, but on the rare occasion they were up against a team which had the physicality and speed to match up with them, they could switch and play possession, too. Baker acted like an ass on the sidelines if they weren't killing the other team, however.