Berlin has 431k street trees. Toronto has 11 million trees (including presumably ravines and natural areas) - and I'm sure other cities have similar amounts. Why do you think Berlin has the most trees?
https://i.pinimg.com/originals/7e/5e/70/7e5e7045c4443f645731...
when I think of Toronto I think more of this:
In German cities in my experience treets often seem more imposing or covering more space, maybe that's the difference as North American streets are much wider.