Frozen-the DB stops where it is and payout will be based on what it should be as of date frozen. Usually an age weighted 401K is put into place.
Terminated-goes to the PBGS and payouts are based on their guidelines.
When they terminated the pilot plan at USAirways the difference was that I would have gotten more than twice as much if the plan had been frozen rather than terminated. Of course they terminated the plan because the company, the creditors, and pbgc made out on the deal.
Good luck,
Merry Christmas