This might finally be the pick for me.  I have tried a zillion picks over the years.  I'll leave the thickness to you all, but no matter the thickness, there is something good about the slight depression on both sides that is very comfortable.  I'd call it a "pocket" for your thumb and finger to ride in.  It almost feels like a neutral "home" position for your finger/thumb to stay in.  It's good.  I go back to a flat pick now and it feels foreign and slippery.  Give em a try.