On Friday night, I decided to learn to play with a pick, but the only pick I had was a Dunlop nylon .73mm pick. It constantly spun out of position in my hand and I didn't like how it flexed. Yesterday, I took some recommendations from this thread (thanks everyone), and went pick shopping with my .73mm pick to compare. Out of all the picks in this thread, the shop only had the Dunlop Gator Grip 2mm, and Dunlop Big Stubbies, 2mm and 3mm. I noticed the Big Stubbies were a lot harder to spin out of position, so I took both sizes to the bass department for a trial run. In the end, I grabbed the 3mm. It was less prone to flexing than the 2mm, and I could play quicker 16th notes with it. Also, it didn't feel too much thicker than the 2mm. I think the divot in the middle helps with this.