I owned TAF for a while and i currently own Tron, but liking any game depends heavily on what the players pin preferences are. TAF is a very good game with nice touches, but the flow is interrupted a little too much for me and the sounds are, well,..sh*t. Tron is arguably the fastest game ever and demands precision accuracy at those speeds to be any good at it. Its also a painfully brutal drain monster if you lose ball control.
TAF is good, but imo it has less long term playability factor than Tron by a long way.