Hydrostatic drive can have parasitic losses in HP up to 25% but It's also much easier, faster to switch from forward to reverse and reliable. The MF brand is good and you should have no issues with parts or service.
I ended up choosing a 9x3 gear transmission. Though hydros making doing loader work significantly easier, I opted for the 9x3 because I do alot of plowing and discing, several acres worth, as well as pulling a wagon overloaded with firewood. I have heard stories of hydros overheating during those sorts of activities, doing nothing obviously for their longevity. I don't think there is a WRONG choice, there are good and bad points for each transmission type, just be sure to weigh all of the facts with the type of work you will be using your machine for.
