I don't think either has an appreciable edge in Connecticut.
Personally, I would choose Roger Williams. I visited both schools and agree with you about the "personal feeling"; I really liked Roger Williams, although I didn't end up going there. I didn't like the vibe I got from NESL (or NELB, now). It felt very much like a high school and I decided quickly that it wasn't for me.
MrBruceSmith78 has a point about the alumni base. However, I think that longevity argument can flip the other way, too: NELB has been around for awhile and continues to sit at the bottom of the rankings, whereas Roger Williams is still building itself up. If either is going to climb higher in the next 10 years, more likely it will be RW. And another reason for that: NELB will always be competing with the Boston crowd, and will always be compared in their shadow. RW can stand somewhat on its own. Finally, the sense I get from RW is that its alumni feel more connected than NELB's—maybe in part because they all know the school is so new. That's a major selling point, at least if you're planning to work (even temporarily) in the vicinity.
Don't be afraid to negotiate. It's a tough time because applications are up, but tell RW what NELB is offering and see if they'll match. Or if you're leaning the other way, tell NELB and see if they'll sweeten the offer.