The best way to choose the right pick up is to find one that complements your guitar or bass tendencies. Certain types of guitar materials produce naturally loud sounds while some are low. Depending on how loud your instrument is, you could choose a pickup that boosts the output or counterbalances it. In order to find out which one is suitable for your guitar, listen to the guitar without plugging any pickups.  Find out which aspect of the sound from the instrument needs improvement and buy accordingly. Top four factors to consider while choosing your pickup are: 1. Guitar’s Pickup (original one) 2. Guitar Material 3. Musical Style 4. Output level