Flakes were "invented" by a worker picking the accumulated chocolate off the part of a machine where the conveyer belt ended and the chocolate got scraped off at the end.

Twix was invented by a Scottish granny who wrote a letter to Mars saying she melted Mars bars over her shortbread fingers and everyone loved them.

Twirls are superior though, unless you're eating a flake in a bath and the crumb catastrophe can be ignored.