My life expectancy has gotta be low given that my parents only made it to 74/75 and my brother died at 46....I've got a million other health challenges
If you indeed have a low life expectancy, as you indicate, this would be something which might tip the scales towards tissue valve. But, you seem set on mechanical and at the end of the day, you need to make the choice which you feel the most comfortable with. You have weighed the pros and cons of each choice and there are advantages and disadvantages of each. If you go into the decision fully informed, there is no wrong choice. As Superman likes to say, you make the choice which lets you sleep at night.