My tin hat is on but...
777, one of the worlds most advanced aircraft...dummed down to make it familiar to Boeing pilots.
TAC's flaw IMHO is that it relies on engines data to sense aysmmetric thrust. If no data available, say engine separation or such severe damage that the sensors have exited the rear of the engine too etc then TAC cannot function.
When it works it is brilliant because it works when flying manual too (even with feet away from the pedals (SIM demo during conversion) it contains the swing and you can fly happily hardly noticing a big difference from the both engines running case), but I think the Airbus method is more reliable using a rudder channel in the autopilot but limited in that it only works with autopilot in.
Which is best?
Personally...could I have a combination of both systems please.
(flown both 777 and Airbus and pleased not have had the need to test either system except in the SIM)