So yes... its been a while since I came up with a random poll... so without further ado.
Given the choice, Immortality or Invincibility.
Immortality allows you to live forever, immune to diseases, and get to appear the age you are now for the rest of your life... but, you can still be killed. i.e getting shot, stabbed. etc
Therefore, so long as nobody kills you, or you're not in an accident, then you will live forever, although, when the universe eventually ends (provided you live that long) then your life will end.
OR
Invincibility, which makes you immune to everything, you can't die from external sources, i.e getting shot, stabbed etc but you only live an average life. 80 or so years, then die.
So you live your natural life span, without needing to worry about dying from unnatural causes.