1. The sweet spot in the composite is much larger than the aluminum - which means you don't have to square the ball up on a 3 inch sweet spot ( aluminum ) vs a 7-8 inch sweet spot on composite
2. The aluminum is best right out of the wrapper and loses "pop" as the bat ages, failimg usually around 400-800 swings with 47 core balls vs a composite that will be at 80-90% out of the wrapper and only get better as the fibers break in. So a guy swinging a 400 swing aluminum is at a disadvantage vs a 400 swing composite
3. Cold weather, absolutely couldn't hit alloy in 45- degree weather, most composites will hold up to 45 degree cold weather
4. Manufacturing - Today's composites are much better made and held to better tolerances than the Aluminum bats. The swedging of the aluminum blanks wasn't nearly as precise as today's composite procedures. With Alloy you also had heat treatment, anodizing and barrel finishes that could effect performance.
I have a green ritches superior no warrany and the lowest of the low of composites will out distance it by 20%.