I'm not at ease with thumb pick, since I use my thumb a lot to mute and slap.
I usually play 3 fingers so when I need to alternate quickly between pick and fingers, I hold the pick with my thumb and pointer and play 2 fingers with middle and ring.
I usually play 3 fingers so when I need to alternate quickly between pick and fingers, I hold the pick with my thumb and pointer and play 2 fingers with middle and ring.