The answer to thing depends on several things. First, the age of the child and who will be fastening the skates is important. If it will be the child, then they may prefer the easier buckles to the laces. Some models of skates come with both laces and buckles. If tying the laces is not a problem, then the choice is a matter of stability and support. the laces by themselves will provide adequate support for the foot and ankle, as most of the laces go up to the ankle. With just the buckles, most of the support is just in the ankle or on top of the foot. This has to be on fairly tight to give the best support. with buckles and laces together, the child has the best support and strength for the ankles that are developing into the most important part of the body for skating. The ankles take plenty of abuse from falls, twists, turns, and jumping, so it is best to give them the best support you can.