The one that you have equity on. Irvine has had better appreciation than Marina Del Ray. If I were you and if you had equity in both condos, I would sell them both and get a 2 bedroom or even more. Now is the time, you should take advantage of low interest rates. It makes a huge difference to get a mortgage at lower interest rates even one percent makes a huge difference.
If you need more information, please give me a call, I am local agent in Irvine.