What are their market values, and what are the monthly rents/costs?
It sounds like one is unbelievably horrible (cash flow negative=sell immediately, unless there is some really weird mitigating circumstance), and the other, hard to say since you didn't really provide any information about how much it cash flows or how much it's worth.
Agreed that you need to explain the capital gains comment, too. Do you mean that you will take a loss on them if you sell?
-W