CPU
3 x 3.6 GHz < 6 x 3.2 GHz

RAM
4GB < 16GB (although you said MB, I can't imagine it'd be that little)

HDD
250GB < 800GB

The underlined value is the greater of the two.

That said, if connection speed is a concern, you'll want to make sure that whatever server you choose, it's either physically closer to your target audience or you utilize something like a CDN.

Lastly, just because you have more resources like CPU and RAM, doesn't necessarily mean that whatever you're planning on hosting/building is optimized for speed. A well-written program created by an experienced programmer could run much more efficiently than a program that's just thrown together.

~Sovereign