I voted for the Children of Hùrin because it was more approachable and readable for me. But that is not because I think that the Silmarillion is not a worthwhile read. I loved it. I just think that CoH would be a good initiation into the larger framework of Middle Earth for somebody who has only read the Lord of the Rings. I think so, not only because Christopher Tolkien says so in his forward to the book, but also because I found it a much easier read than the Silmarillion, and because it is smaller in scope, it is a good test for if you would have the patience to delve into the deeper stuff or if you would prefer to remain a Hobbit/LotR only kind of fan.