Domain name selection

Would you rather register a exactmatch.us or exact-match.com?

How do .us domains fare in SERPs? Since every other country uses their country TLD, I would think soon .us will be on the same level as .com/.net/.org.

Anyone have experience ranking a .us site?

Noone has the answer to that in truth. Its a tough question.
Some will say that hyphenated domains are hard to rank (including me).
Also - i have hardly ever seen a .us ranking for anything. But this of course doesnt mean they dont - it may just mean people owning the .com push harder?

For me - I would register both and spam the f*** out of them.