There is better than a 50% chance the CT's will pay off IMO. I am in to the end no matter what. Whatever you buy, realize this could also not pay anything. So you have to decide if you are long or not. I am willing to take that gamble. Buy the cheapest ones you can get. All of those 4 are equal in line for a payout before any other preferred or common get anything.
All the above is my opinion, after all who would believe me anyway since I drive a 1975 Vega!