Most people, eat certain foods, because of their taste and texture and do not think too much, in terms of advantages, and disadvantages. However, if you ask about the main advantage, eat pineapple. Fresh or drink your juice.
Pineapple is much better fresh, is a source rich in bromelain an enzyme, which reduces proteins in units, smaller called amino acids. If you consume pineapple just before or during a meal rich in protein.