Ouch, neither sound like a good choice. If you have a driveway, you can remove the other dirveway to create a backyard. If you do not, keep the driveway and create a small garden patio or somthing. The function of a driveway is much better selling point with some decorated flower pots around the edges. Parking is one of the main things that can make a person really, really mad and they might not even consider your home without two places to park.
You never want to choose between a bedroom and a bathroom. But if you must, the first choice is three bedrooms and one bathroom. Next, would be two bedrooms and two bathrooms. The bedrooms and bathrooms are best at or above ground level.
Talk to a Realtor or a Pro and have them walk through your home. You do not want to make the bedrooms too small or the bathroom too small or change the floor plan and nothing really works. Bathrooms next to the bedrooms and 1/2 bathroom on the main level is nice.