Which one has the better tires on it.
Pred 90 or the sportsman 90.
Mostly trailriding and maybe just a little mud hole here and there.

 

the pred has a moto x style tire that is a lower profile which makes it handle better in the turns and the sportsman has taller tires that gives it better ground clearance. if the pred has enough power to use, then the lower profile tire is better for floatation across the mud but for trail riding the better of the two tires are the taller narrower ones they will keep your youngster from getting hung up on trail obsticales