Ben a condominium differs from a single family in that all the exterior care will be taken care of for you. They may have amenities such as a pool and clubhouse a single family wont have. Where they are newer there will be less maintenance. With a single family you can get more privacy and can get a similar sized home as the condo but you will have to hire soemone to maintain. Alot of over 55 complexes have snow birds, it is relatively easy in the condo to winterize and head out for the winter, neighbors will be watching, maintenance will still plow your driveway and shovel the walk. In a single family you have to hire it all out, and your neighbors may not be as close to watch your house.
i would be more than happy to email you listing sheets and assist you with finding a home here in NH. Just email me direct at email@example.com and i can get them right out so you can see the prices.