A normal room in BC will be bigger then a studio at BCV. BCV studio will have a full size bed and a sleeper sofa and a mini kicthen area. We spend a lot of time in studios since we tend to do multiple trips and need to say points. It can get cramped, but we manage fine and love DVC.
One year our friends stayed at BC while we at BCV. Their room at BC was rather big, had a fridge in it, a lot of storage and a day bed in addition to the 2 queen beds. They had a lot more room then us in the studio. We moved to a one bedroom that trip (were in the studio for the weekend when the points were higher). My niece slept in the sleeper sofa, and my kids in the king size bed with us (or pack and play.) My kids like to be with us when they are not at home, so having their own room doesn't actually help that much when they are young.
I love DVC, but I don't think I would bother with renting points. Besides depending on when you do it, it might be more difficult to find room availability with points in a one bedroom then cash in a BC room. Oct is food and wine so BCV and BWV fills up fast with DVC members who go every year for it.