I think the composite bat hit the farthest.
Typically a lite weight aluminum bat will hit a ball further than a wood bat.
Aluminum....thats not that hard it is metal so it goes further where wood absorbs the force.
its not the bat its the batter that matters
A corked bat might help with hitting the ball a bit but because the mass of a corked bat is different then to a wooden bat that you would be hitting it with less mass witch means you won't be hitting that much home runs form a corked bat. plus the corked bat is illegal to use in professional baseball in America. so if you wanted more home runs don't use the corked bat.
The Miken Freak is by far the best bat.
I would say the best bbcor bat on market currently is the Akadema Apocalypse. The Rawlings 5150 has received some good reviews as well.
its the same
metal also known as aluminum