https://twitter.com/ericfrancis/stat...366156800?s=21
Hockey Canada announces starting next season it will scrap novice, atom, peewee, bantam & midget hockey. To simplify and be more inclusive, the new age-division names are Under-7, U-9, U-11, U-13, U-15, U-19* and U-21.
https://twitter.com/mattpisko/status...233945602?s=21
So really, there is no difference, other than naming.
U7 = Timbits
U9 = Novice
U11 = Atom
U13 = PeeWee
U15 = Bantam
U19*= Midget
U21 = Junior
*Appears to be a typo in the original reply tweet. Hockey Canada has Midget as U18