I have just found out there are so many ITF tournaments for juniors in other parts of the world.
I narrowed it down to Europe for January - one can play ITF every week.
Traveling in EU is probably similar to the continental US. Thus, the elite junior players with pro tour ambition would get better competition playing ITF. New national Grand Master and Sweet 16 or Winter Teams would benefit only the younger players who are not quite ready for ITF. Forget about ITF if our kids are attending regular schools.