What is better composite bat or aluminum?

Composite is better if you want more power, but you need to break in a composite bat (about 200 hits w/ leather baseballs). Aluminum is the best once you buy it then gradually loses pop after each at bat. I bought one of each kind. Both work good for me, if you mix up the use of each. I would suggest that you get a "practice" bat and a game/cold weather bat. To preserve your $300-420$ bat.