Invulnerability. You could do the most stupid stuff in the world, survive it without a scratch, and make money. Plus, as an invulnerable person, your life will naturally be extended to it's theoretical peak (invulnerable means invulnerable to all things, including, say, disease, cancer, etc). Immortality means that, eventually, you will be caught in a situation you can't get out of, like being cruched by a rockslide or something, and you then be stuck there. Forever. With no way out.
Yeah. Invulnerability all the way.
Yeah. Invulnerability all the way.