the thumb, the pop, the tip, the pick, the tap... what is importat is what fits and what you like... i generaly use a pick on fast monostrings tap for solos finger for everything pop and slap whn aggressive rithmics are needed by the way with a correct and well developped technique you can be twice as fast with fingers than with a pick remeber you have 4 fingers and only one pick i know hard to acheave but not impossible