The reason you didn't hear alot about Aruba is because All Saints Aruba is only 3 year old
The schools you mentioned are much and much older anf therefore better known.
If you want to know more about the island check the different websites and all the daily flights Aruba has from all around the US, Canada and other countries

The teaching style in Aruba is the same as the others, remember all schools have the same curriculum, however the advantage that the students of All Saints Aruba have over bigger schools is because the classes are smaller and there is a very good and continous interaction with the professors.