Selling either contract, obviously you will have to pay off the loan with the proceeds. If you are upside down, you will have to put money IN at closing.
Also, if you use a broker to sell, plan to pay 10-12% commission. You'll also have some minor seller fees to pay.
My guess is that, with either contract, even if there was no loan, you would take a loss just because the resale prices are lower than what you probably paid. You can get an idea by looking at the TTS listings, with special attention to the Sale Pending listings which show actual selling prices rather than asking prices.
You have to do the math for yourself, but if my guesses are close to correct, Dean's advice of renting your points would be very sound.