What is the difference between abec 3 bearings and abec 5 bearings?

My son wants a skateboard for christmas. He is seven years old. I know the level (1 3 5 7 9) has an effect on the speed. I don't want something that going to just fly out from under him... but I don't want something that is super slow either. When i was at the store the wheels seemed to spin either... show more My son wants a skateboard for christmas. He is seven years old. I know the level (1 3 5 7 9) has an effect on the speed. I don't want something that going to just fly out from under him... but I don't want something that is super slow either. When i was at the store the wheels seemed to spin either faster or slower (like there was more resistance)
What do you recommend?
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