You live in the NE, why not go and check them out.
My impressions, and they are impressions only:
The Bay Voyage is closer to town. Would be possible to walk, about a half mile.
Newport Overlook at one time was in need of refurbishing. That may no longer be the case, I haven't kept up.
Units are bigger at Newport Overlook, Bay Voyage is limited to 1BR and has limited cooking facilities.
Bay Voyage has a well rated, and relatively expensive, restaurant on site. Best Sunday Brunch in RI many times as well as other awards.
So, it may be in the eye of the beholder, seriously, why not take a trip and check them out for what you may be looking for. Generally probably Familys v's Couples values.