Well at the time of my operation I didn't look into it much. I allowed the doctor to choose and his opinion was that patellar grafts are better if sports, especially action sports like skiing, were in my plans for the future.
So yes, I had the op and had a graft from the patella. It hurts, still, even after more than 16 months, but the pain gets less & less gradually. It's only bad when I have to kneel, basically it makes your kneecap more sensitive to pressure, but in hindsight I'm glad that he chose this graft because it apparently holds a little stronger than hamstring (I don't know how accurately this kind of thing can actually be researched, I would guess it's very much a personal experience though).
Nonetheless a correctly performed hamstring graft is surely a good thing, and will likely be able to withstand tension very close to the amount of tension a normal ACL is subjected to.
Another thing that happened during my surgery was that the left side of my knee lost some nerve connections, just because certain incisions have to be made. It means I have slightly a numb feeling on that part of my knee but I feel that it slowly is coming back.