Hi Raoul,
I was in your shoes when I just turned 33. I had my first surgery with a bio valve back then. I just had my second heart surgery in May to get a mechanical valve (I couldnt have a Ross due to large aortic annulus). I found that the hardest thing is actually making a choice that is right for you and you are happy with.
I wish you the best of luck with your surgery ad will keep my fingers crossed for you that day. Having been through surgery twice, I can tell you it isnt fun at all, but modern hospitals and all of the cardiac nurses are amazing in helping you back on your feet. I suggest you take a good book (or your tablet with some fav netflix shows downloaded), some warm clothes (My room was really cold and despite asking a number of times, me catching a cold, it still wasnt possible to make it warmer), good external comms (I.e. phone etc) and finally, I took my own pillow - I found it reminded me of my home and my family when I was lying there sleepless at night.
Best of luck and please do let us know once you are on the other side.
Tommy