I've wrestled at cadet duals (I know it's not junior duals, but still close), and at Disney in the all-star division for Hoosier Elite, and both are really challenging, mentally and physically. Every match in the all-star division is tough, the worst kid I wrestled was a state qualifier from Nebraska, who was still pretty good. On the other hand, cadet duals featured a lot of great freestyle/greco technicians, some really tough kids. Having to make weight both days was no easy task, either.
Both events are loaded with great kids, and you'd be hard-pressed to find an easy match all day. I personally thought cadet duals was a bit tougher, but that's likely because I'm not as well-versed in freestyle/Greco as in folkstyle.