I have had both a patella and a hamstring graft done (on the same knee in less than a year). They both have their benefits and I would do whatever your surgeon thinks is best.
I will say the thing I hate about the patella graft is the scar right down the front of you knee that is painful to kneel on for a good long while. On the positive side I was told that this would actually grow back in.
Downside to the hamstring is the amount of rehab you have to do to get it back to where it needs to be.
I can't really give you the pluses and minuses through rehab because with my patella graft I had a staff infection that basically took all the elasticity out of the graft and had all the issues relating to that...