Vampires or Dawnguard?

You get some cool unique Dawnguard weapons with the Dawnguard and awesome enhanced crossbows. With the Vampires you get unique rings of blood-magic.

I personally like Dawnguard more, but the personalities you get to interact with within Harkon's court are more.. interesting for the most part.

Both sound great. Darn.

The rings are pretty awesome and the Enhanced Dwarven Crossbow is pretty stellar as well. You also get exploding bolts.

Can't really go wrong with either but I get the willies in that castle plus I think the Dawnguard generally get's more stuff so I like going with the Dawnguard.