Should You Use One Or Separate Local Sites To Optimize A National Business Loan Site?

In Hump Day Hangouts episode 212, one participant asked if one should use multiple local sites to rank a national business loan site or stick to one site.
The exact question was:
2.) We lend nationally but also locally, should I set up a separate site and optimize it specifically for local ? Or should I just use 1 site for everything.
Thanks in advance!
Israel
