I was in Canada a few weeks ago and brought back some coins with me. The toddler in my life likes playing with coins (feeding them to her froggy bank, rolling them around…) and she likes these new Canadians ones much better than the American ones.
The dollar bills were toddler friendly too. For example, the $5 bill is bright blue and has people playing hockey on it. Unless your son or daughter is in to iconography of the Freemasons, then the Canadian dollar bills win here too.