A guy I know bought some Canadian silver maple leafs, too.
He claims the silver Canadian silver maple leafs have a higher silver content than the American Eagles.
That’s true - 99.99% vs 99.9%
Yet, for some reason the US coin trades for a $ or so higher.
I still bought the Maple Leafs anyway, because I could get them for a $ or so cheaper :-)
I figure it all comes out in the wash - and the silver content difference is minuscule.