As with anything else in our art, picks are largely about preference, but I'd like to suggest a slightly different point of view that might be helpful.
I find a thinner picks allow me to move quickly, moving through the string's path, but can create more of a scraping sound that I only desire for a limited effect (think Dunlop Tortex .73 [yellow]), suitable for Tool covers. Also you trade off some low end, often for a bump in the low mids.
Thicker picks are great for many hard rock songs, with great bottom end, but they can be clacky, and the edge of most gives an awkward release by forcing the string to pass off the pick. (Fender Heavy, Extra Heavy)
A perfect combo for me has been the Dunlop Gator Grip 1.5mm (powdery green) because they are stiff, but offer a wonderful beveled edge. They create a deep sound, the ability to change the top end chime to nearly non-existent to more obvious. No suffering in the lows here. They also grip the string enough to not slip off for a weird chime like Big Stubby's do.
For what it's worth, I primarily play with a hybrid technique using the aforementioned picks and fingers/thumb. Cody Wright sounds
very similar
here and
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