I would prefer to see the Canadian maple leaf. They fought for this country, not the old flag. The maple leaf represents everyone who has ever been Canadian. Flying an old flag makes it look like they only fought for past generations. I'm sure they would be proud to feel they fought for us as well.
The Flag of Canada is the Maple Leaf on white with the two red bars. I have watched the Remembrance Day ceremonies from Ottawa for the last forty years or so. None of the WW1 vets ever had a problem standing proud saluting our flag. The red ensign is history, just like Vimy Ridge. I have no problem with having the red ensign there but the maple leaf is Canada's flag.