Mac computers are not good to keep in schools. They are confusing for many students to use as compared to the regular PC. If you compare copying and pasting something in a PC to something on a Macintosh computer, you may notice that it is way simpler on a PC, thus less time wasted for the students.
When you say "personalize" I assume you mean changing backgrounds, wallpapers, taking pictures, and everything else. If so, none of that is needed and everything else can be done on a PC. They have Word, PowerPoint, etc with all the same features. As a result, Macintosh computers are really just fancy looking computers that cost more money.