Between those choices, go with Roger Williams. Despite the rankings, there's a lot of in-state favoritism shown toward Roger Williams—especially by judges (if you're interested in a clerkship), but also by firms and government jobs. If you're absolutely sure that you want to work in Rhode Island, then Roger Williams will give you a much better network than either Suffolk or NESL, which are both very Boston-centric.
Also, the guy who runs RW's career services department is unusually involved and good at his job (relative to what you find at many schools). In this economy, and especially for a school with local focus, that's a major selling point.
(Disclaimer: I didn't go to RW. I chose a Boston school.)