As others have mentioned, so much depends on your family dynamic. But if I were making the decision for my family in this situation, an All-Star Music (renovated) Family Suite would be my first choice. They're really nice, all beds are queens, and the main bedroom is totally separate from the living area with the pulldown beds. Since you mentioned the G-rated household aspect, I would have your sons on one pull-down bed and the GF on the other. Of course college age kids are adults...but they're also still in college and probably pretty used to being flexible with sleeping arrangements, etc.
Adjoining rooms are an okay idea as well, but I'm always nervous about not knowing for sure if you'll get them connecting or close. I think the suite sounds like a fun time! Also a nice kitchen space.