Most composers do summer programs during undergrad years. It can be smart to go to programs/festivals with composers in residence who are faculty at grad programs that your son might be interested in, after Berklee, but not necessary.
The main thing to look at is the prevailing aesthetic, and the fit is partly determined by admission 
There are many wonderful festivals in Europe too.
Many schools fund these summer programs for students. Does Berklee?
As for being more or less equal, they may be equal but different …
For info on summer festivals, programs and residencies, good resources are the Composers Site, and the Umbrella Platform (the latter tends toward the progressive). Also Walden School (Dublin NH) has a great list of opportunities on its website (their program is for high schoolers but the opportunities list has listings for undergrad and beyond).