Canyon Creek is more kid-friendly. More exploration up and down the creek without bushwhacking or climbing. It's open meadow for a couple miles, great for wandering. However, Haigler has deeper pools and is better for swimming. Just expect a little more work involved if you want to make your way upstream or downstream.
Done several backpacking trips to both locations. Overall, I prefer Haigler for various reasons. Fisherman Point would be a great access trail with an 11 y/o. But you can't go wrong with either.
"Arizona is the land of contrast... You can go from Minnesota to California in a matter of minutes, then have Mexican food that night." -Jack Dykinga