Marvel pearl, symmetrical = cover dominant, smoother on the back, needs friction downlane to be truly effective.
Anachy, asymmetrical = core dominant, flippier on the back. Doesnt need as much friction, can (in a sense) give you more reaction with less friction because there is something there (the core) to get the ball to turn the corner.
On your average THS, you arent going to see much difference in the amount of boards you cover just in the reaction shape and where the ball chooses to hook. When the condition tightens or loosens up, or sport shots, is where you'll see the difference.