I'm not a finger picker, but I don't think there is a definitive answer as there are all sizes of finger out there.. Even a web search didn't prove to fruitful.. I would suggest going to a music store and try some on.. If they should have someone there that is a finger picker, get there assistance.
Lisa McCormick may be your best help her.. I beleive she preferrs her finger nails.. They can be strengthen with fingernail product and would not to adjust your fingers target as much as a pick.. They do have a curve and would make you relearn your target strings..
I hope this help..
Good luck and happy picking
Gordon