Columbia
Pros:
- Well established
- Matched multiple classes
- You have all the resources of the undergrad campus
Cons:
- The town can be a little shady
- The actual school is in older buildings
Greenville
Pros:
- Everything is new and shiny
- The town is really nice
Cons:
- You have to wear business casual dress (might not be a con for others)
- Haven't matched a class yet
Both seem to have a good hospital for clinicals and both seem to be in affordable areas. Hope this helps and I hope others chime in with more information.