TG2 is capable of much higher quality than TG 0.9. It also can do lots of things that TG 0.9 can't. In that respect, I would recommend purchasing it. However, it is quite complicated and takes a different approach to constructing scenes, so I would recommend downloading the free version of the Tech Preview first just to make sure that the interface works for you. You also can't migrate entire TG 0.9 projects over to TG2.