I'm pretty sure German is way easier than dutch.
I'm certain that you will never master the dutch grammar....
because at least 90% of the dutch people can't even properly spell .

But once you've learned German, learning dutch is pretty easy because the words are about the same.
There aren't much reasons to learn dutch though, we're a pretty small country, we don't really rule the markets.. etc.
If you plan to move to europe the best place to live would be germany really.