Basically bat profiles normally revolve around the type of player you are, they type of pitches you play on and mainly current trends.
generally Asian bats are more bottom heavy from having lower bounce from the pitches and the "middle" is lower which will have an effect on the pick up.
the trend is towards very big bits of wood with huge edges and concaves. Asian manufacturers often dry the willow more than UK makers to get biger profiles.
When you play you tend to try and hit the ball where the bat's performance is best, i.e the middle.
Subsequently someone who is used to hitting the ball lower in the bat for years will, i guess play slightly different shots to someone who has played with a bat with a higher middle.
Youcould go out with a bat that feels very different and "wrong" especially if you are playing shots on a low bouncing pitch that never come off the "middle" of a more english high middled bat and was less forgiving on shots plyed from the edges.
Not a science, but more about bats feeling right for you.