My kid is only 9 and needs a new set-up. Should I get him one of the smaller decks like a TSI Freestyler 19" X 4.25" or Phoenix Reventon 19.5" X 4.25" or does the size not make that big of a difference. He hasn't tried enough other scooters to know what might work best. He trashed his Razor Pro in about 6 months jumpin 7 steps and learning to grind.