In both cases, you would be mortal and die at the same age. Being invincible just means that you're immune to physical harm. Invisibility can be turned on and off at will.
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- You would rather have a lightsaber (Star Wars) than have a phaser (Star Trek).
- You would rather be tall and really skinny than be buff and really short.
- You would rather Be 4 feet tall than Be 10 feet tall.
- You would rather Chug a pint of ocean salt water than Chug a pint of rancid milk.
- You would rather Spend a day in the North Pole than Spend a day in the Sahara Desert.