Michelle - Although I applaud your surgeons' enthusiasm, I am afraid I don't fully agree. Yes, I have a tissue valve, but I was 63 at time of implant and I am aware of the fact that I could need a re-op in the future myself. If you are OK with that, then by all means, go with the tissue valve. If you want to minimize the statistical likelihood that you will need yet another surgery, then I would go with a mechanical.
I think many of us choose tissue if it is at all practical, in the belief that life after surgery will be as much like life before surgery as is possible. We didn't want to deal with anticoagulation, and are willing to accept some element of risk of re-op to avoid the anticoagulation. That thing of "life after" being like "life before" is over-rated and may not be possible for any number of reasons. My life is the same as before with regard to my valve, but after surgery I also needed a pacemaker. We can't plan it all, we can only play the hands we are dealt.
There are pro's and con's to all of the choices. We teach new folks that the only really "bad" decision is to decide to do nothing. That one rarely ends well, and we are all about helping people maximize their life potential. The choice of tissue versus mechanical is a very personal choice, with some statistical nuances. I feel that you should be fully entitled to explore the options and choose the one that is right for you - even if your surgeon is trying to make it "easier" for you in the future.
I have a tissue valve - by choice. I am not afraid of anticoagulation, though. My mother used it for years, as has my mother-in-law. Heck, I even took warfarin for 3 months after my valve surgery. It is not a death sentence. It does require management, but if you are able to self-manage, it is not the "bad deal" that people claim it to be. We have members here who have been using warfarin for decades, and they do all the things they wanted to do, and survive quite well.
I would suggest that you talk with your surgeons about your preference. If they have a medical reason for recommending the tissue valve, hear them out but make your own choice. If they are OK with that, then proceed. If not, maybe it is time to meet another surgeon who is more willing to consider the wishes of their patient.