Don Mills. Titans, JRC, Marlies, Kings are always up there but Don Mills are 3 time repeat champions.
Outside GTHL I expect Huron Perth, Sun County, Barrie to push for top 10 spots in the province
Not familiar with Ottawa teams but have heard Myers, Valley Titans, and Cyclones are solid
GTHL: Flyers, Titans and Jr Canadiens are the top teams in Ontario. Marlies are good and will probably add some players for U16 as they always do. Vaughan has struggled in this age group since their success in Atom.
OMHA: Barrie, Oakville, Quinte and Ajax are probably the top teams. Barrie is competitive with most GTHL teams but I understand some of their top players are heading to the GTHL.
Ottawa: Ottawa Valley Titans and Ottawa Myers are both strong teams but have had some good players leave for the GTHL.
Alliance: Sun County, Huron-Perth, Waterloo and Elgin-Middlesex are all strong teams. Sun County and Huron-Perth are both top teams in Ontario.
Noth: There are no competitive teams from the north IMO but there are some strong players. The best, being Chiatroni who played U16 in Barrie this year.
US: The O might draw some good kids from top teams like Honeybaked, Little Ceasars, Florida Alliance, or Penguins Elite.
I have coached this age group for the last few years and am excited to contribute to this conversation as I'm not connected any longer and have moved on to a younger age group again. The list posted earlier that GermanSpitfire made is pretty good IMO. It's missing a few good kids but it covers most of the big names. This group isn't as deep as the 07s you're all familiar with but I believe it's a lot stronger than the 08s.