Hi,
I doubt it's neither, but would love to be proved wrong.
John Round & Son did do a large business in Canada, if that is the origin of the spoon, but their advertisements for the Canadian market show different marks:

John Round & Son, Limited - Montreal - 1906
The trade mark of Joseph Rodgers & Sons, the Star and Cross, was so well-known around the world as a mark of quality, I cannot see them leaving this out of their marks.
That said, I'm sure in the back of my mind that there was an English maker that used a maple-leaf mark, but at the moment it escapes me.
Trev.