UTMA is children's asset, it affect college financial aid application more than other accounts. Children's asset is calculated at 20% rate, while parent's asset (529 and Coverdell) are calculated at 5.64%.
Also when children turns 18 (or 21, depends on states), the money goes to the child, you can't tell him how to spend it.
I'd stick with 529 and Coverdell for educational purpose.