i have a bunch of kinds of picks.
One made entirely out of silver... it tears the shite out of strings but the tone is insanely awesome... kinda makes a wierd scr@py sound though...
Pickboy .75-1mm... glossy, you hear the note and the note only, you dont hear the scr@pe of the pick against the strings, its quite amazing... super fast to play with too, they're my shredder picks. The one downside is that they are made of nylon and wear out fast.
Dunlop 1mm... tortex, makes the scr@py sound, but its SUPER durable, and is my practice pick because its the most difficult to play with. I practice with this puppy and use my pickboy's at gigs.
i have a few tortoise shell picks, they dont sound good, they dont flex right... i really dislike them. Perfect for accoustic guitar, not for electric, and im a strict electric player... My grandpa gave them to me and i've only used them when i was in a squeeze.
i have yet to try jazz III's...