I'm not a bass player, but I've been buying all sorts of different picks recently because I'm trying to figure out what works for me. I keep on coming back to Jazz IIIs because of the shape and size of them, and I've found that I vastly prefer the nylon one over the tortex one. The tortex feels very slippery in my fingers and I have a hard time holding onto it when I try to play harder solos. The nylon one is more textured and grippy and much easier to hold onto without having to use a death grip. That said, the tortex one is great for strummy songs (Wonderwall anyone?) because it is more slippery and glides across the strings nicely...if I can hold onto it...