For electric, I use a medium heavy plastic pick, mostly fender tortuois shell color. I like the plastic that they are made from. I don'y like the nylon picks at all. For acoustic, I'm very picky about shape, material, and thickness. For shape I like picks with three equal sides and rounded corners. I am using natural materials for picks, horn and hoof have the best tone since it illeagal to buy/sell real tortous shell these days I only use my two remaining tortuois shell picks for recording or a important event. I like thick picks for control and reduction of pick noise, on average a litte thicker than a quarter. If you don't believe me try it for yourselves. Compare thin and thick picks on the same acoustic and try out nylon, plastic, and horn. It's amazing how much difference these factors make in sound quality and tone.