I use the big triangular ones too.. But I'm a bassist, so I need a bigger pick. Actually, even with the bigger pics, I've had problems of them slipping out of my fingers when they get all sweaty playing live. That's why I've started to carve a grip-part to them with a knife. Few slashes up and a few down to make a grid, and they don't slip anymore. Works for me.
And please don't give me shit about not using my fingers, doing around 200bpm tremolos with my stubby fingers just doesn't work...
Wouldn't mind a Katatonia pick, but I don't think I'd use it. Picks are cheap, so why use and abuse something that cool...