Bank Repo

I am carrying 2 morgages I am behind on one and I thinking about letting the bank repo,beside losing my credit

what other consequences might I have to endure?My other morgage is not to bad and the home is nicer and my realtor just found a buyer but the offer is 115,000 lower than what I purchased it for.What should I Do?

If you defualt on the loan, the lender is going to auction off the home. With the current market, there is a real good chance it will sell under the mortage amount.
They will hold you responsible for the difference between the mortage amount, and what it sells for, plus legal fees. They can sue you for this difference per home. Simply, if you let them repo one home, chances are they may come after your other assets. You might be facing a all or nothing scenario. Manage to keep both, or risk all known assests.