i´ve been using Jim Dunlop BIG STUBBY picks for almost 4 years now and i swear there is no better pick on that planet. every ( E V E R Y ) guitarrist i know who has tried them threw away the old ones and switched to the stubbies. i tried virtually every pick available untill i finally found them. they are transparent dark purple, are 3mm thick but have a very smooth tip. they do not slip from the fingers since they have "dents" on both sides where the fingers fit in easily. they do not wear off at all - they just get lost as every other pick does *LOL*.
basically: the stiffer the pick, the better you can controll it - especially when it comes to speed.