Picks categories
When you choose a pick you must consider
The sound it produces when attacking the strings, according to its material (smooth or not), its flexibility, thickness (connected to it´s flexibility), its shape (that may allow you to attack the string with its back side; if it´s edgy is other important factor). You can test these by muffing the stings with your neck hand while picking the guitar (amplified and without distortion) this will allow you to ear the pick´s sound.
Its ergonomic fitness to your hand, If it´s slippery, due to its material, shape and/or size (bigger picks more slippery and more hard to get on its initial position)
While playing Death metal I like to use a little edgy
Jim Dunlop Jazz III (black, which is more non-slippery grainy). As opposed to that, while playing jazz or rock I use a polished smooth, round and thick Jim Dunlop, Fender or Gretsh that give accuracy and a good bass feeling (close to thumb). If I use its back that thumb-like sound will increase significantly. I just don´t like their size (they´re too big).
