Looks are subjective, nobody can tell you what looks better.
The Silverstone is bigger overall, but has more options with regards to components and potentially better cooling. It's form factor also is pretty useful if you need to fit it into a slim tight space, or into an entertainment centre.
The Hadron is small, simple, windowed (if that is your thing) and pretty understated, aesthetically.
One thing to note about costs is that the Silverstone is very new, and new SFX PSUs should be arriving soonish, so I'd imagine the prices of both will fall, meaning it could end up being a good amount cheaper than the EVGA, which I can't see getting dramatically cheaper.