For a guitar player, a properly chosen pick is as personal as the guitar or amplifier one uses, in some ways even more so, since the pick is such an integral part of both a player's technique as well as tone. Professional guitarists sometimes experiment for years with different shapes, textures, and thickness levels.

Because guitar picks are, on the whole, relatively inexpensive, it's best to purchase several different brands, shapes, and thicknesses so you can experiment and see which one works best for your playing style. Generally, players who have a fast technique will use picks that are a bit stiffer, so as not to flex when playing fast lines. Rhythm players, particularly acoustic guitarists, often favor thinner picks due to the crisp sound they provide.

In the end, it's best to experiment with a wide range of different picks so that you can find one that suits your style, technique, and desired tone.