Wow that's a lot of flavours. Hmm interesting. Maybe Smarties are Uk and M&M's are American. I think M&M's are a bit bigger anyway. Maybe the crunchy coatings are made from crickets lol.
Smarties
https://www.google.co.uk/search?q=sm...RAAQUQ_AUIBigB
https://www.google.co.uk/search?q=sm...=isch&q=M%26Ms
Smarties used to be made by Rowntree before they got taken over by Nestle. I had a factory tour once when I worked for them (in an admin department) and they had these huge copper rotating things that looked like cement mixers, that polished them shiny! I remember they had different colourings for different countries. There was a big thing about blue smarties - some countries they were allowed, some they weren't. Which I can understand now as blue food colouring is supposed to have some issues I think.