I came to the same conclusion as Mentu about all the hemming and hawing over valve choice. It took me more than a full month of solid study reading primary literature and a load of hemming and hawing before I concluded that what my surgeon advised was the way to go. Granted, he said he would do whatever I wanted (as long as it could be done safely and effectively), but he gave me his strong preference and at least didn't leave me hanging out there all on my lonesome to try to make the choice with no good advice. Your surgeon should have a recommendation. If not, I would ask him why.