Why do M&M's have such a larger wikipedia page than Skittles?!
Answers:
I agree that it's mainly because M&Ms have a much longer history.
Skittles will probably never be as popular, as I don't perceive any redeeming qualities there. Fruit juice maybe?
As for M&Ms, chocolate is one of mankind's greatest and favorite flavors. The peanut variety also has, well, peanuts, which are considered healthy.
Neither are really among my all time favorites, although I do love Starburst fruit chews which I believe the Skittles were derived from.
Nobody likes Skittles!
M&M's came before the Skittles. It has a longer history of course.