Is there an advantage to using a Tehillim Ohel Yosef Yitzchok over using another Tehillim?
I prefer kriah age children using a Tehillim with larger print and no Trop; however once parents purchase such a Tehillim for their child, likely he will continue using this Tehillim throughout his school years.
Some people feel that way based on this attachment. But it is purely a matter of hergesh. You should obviously do that which is best for the children picking up the proper Kriah skills.