In 2020, M&M's took the top spot for bestselling US Candy Brand. M&M's is owned by Mars, which also makes Snickers. From my research, it appears that peanut M&M's sell better than the regular chocolate M&M's.
At #9, Dove is known as Galaxy in many places outside of the US.
It's surprising how much larger M&M's sales are than the other brands on the list.