Depends what you're going for. I'd go with the H440 simply because it's a great looking, functional case.
I'm sure the Source 210 is functional, I just don't like how it looks as much.
I'd say the H440, but the two are totally different cases. The H440 is for very clean builds and minimalistic looks. The Source 210 is a budget case that costs less than half of what the H440 costs.
The H440 is a better case, but it's up to you whether its advantages over the Source 210 are worth the extra $50-60.