There are good arguments supporting all the different types of graft, each one has a few downs as well.
I looked at a lot of the research before the operation and whilst the patella tendon graft is the often a favorite,....so is the hamstring to others.
There are many other choices out there people are now use abductor tendon, doing autogrtafts using patella, quad and ham, allograftt using patella and Achilles, even a synthetic can be used.
There are a load of studies that have been done but as yet no have found strong evidence to prove which is the best choice of graft...there probably will be but as yet there is no clear winner.....There have been marginal advantages found in both choices of graft but also disadvantages like the risk of anterior knee pain and risk of weakened patella leading to patella fractures etc.... hamstring tendons often dont grow back () thats why they shave a bit of more than one tendon) and there is normally a permanent loss of hamstring (round 10%). The hamstring graft is also apparently more demanding for the surgeon?
Its all about the Physio afterwards and not being a dick and running before you can walk......