Mung bean vermicelli is made from mung beans, and mung bean vermicelli has a more delicate texture and tastes more sinewy. Pea vermicelli is made from peas, and pea vermicelli is whiter in color, a bit finer compared to green bean vermicelli, and tastes more sinewy.
Overall, mung bean vermicelli and pea vermicelli have their own characteristics, and the choice of which one is better depends on personal taste and preference.