hi Julie,
When i was 16 i had a homograph valve with 24 years on i still have, i was so ill the choice was my surgeons, its only just showing signs of wear so a replacment valve is looming, i think for me a mechanical valve will be next, the reasons my surgeon went with homograph was i was young, i had endocarditis ,and he was the best in the business here in the uk, im lucky not many people get 20 plus years with a homograph from reading this site, plus availablity is low, for what is worth, my experience with a homograph was right, i was young, i wanted to play football do all the normal stuff without fear, i no mechnical valve benefits- ive studdied all this stuff for the last 20 years, however although warfrin is no big deal, i think for me at 16 it would have been a another distraction, my homograph valve was my surgeons call, and not mine, but it was the right choice, for sure.
On Another note my cardiologist says mechanical valves in the young are excellent choices, for 2 reasons the risks are less for clotting in the young (under 50) and the longevity can be more pridictable to,
if you want my opinion on valve choice they are all good today, but the choice i think come down to lifestyle also, tissue valves pehaps allow a little more freedom to start with( up front)- and at 16 i can only say from my experience for the next 10-15 years thats important consideration- which my surgeon got right, what ever tissue valve you were to choose another surgery will be ahead, at which point like me 24 years on and just 40 mechanical looks the way to go now and doesnt seem restricted at all in life style.
good luck with your choice i hope my insite helps a little
rb