Pretty much exclusively a pick player. Started on guitar, and kept the pick when I moved across to bass. When I was playing guitar I used Tortex .60 (Orange) and initially retained the same pick on bass. But it didn't feel quite right, so I started going to thicker and thicker picks, eventually I was playing the purple 1.14s.
But on a lark I decided to try Dava Jazz Grip picks, specifically the red delrin ones...made quite a difference I have to say. The rubber gives me a positive gripping surface, even with sweaty hands, which has allowed me to relax my picking hand and still retain positive control over the pick. It's pretty much cut picking hand fatigue out of the equation.
I have two complaints about this pick, first the delrin tends to wear down really quickly. Second is harder to describe: the rubber at the top of the pick seems to 'come loose' and the "T" top to the pick can become exposed and dig in a little bit. It's not painful, it's just distracting. On the plus side, they tend to occur about the same time, so either is a clue it's time for a new one. Or at least they happen around the same time if you aren't in the habit of carrying your picks in your pocket...
I want to try the nylon and steel versions, and a couple of you have really got me wanting to try the steel versions...