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My point is there is no better gearbox.it comes down for what purpose your car is intended for and what type of torque or hp figures your engine will be producing.Drag cars will prob prefer glide autos,track cars prob close ratio gearboxes etc etc
Personally.for me there is no point running a supra v160 getrag gearbox behind an A12 powered race car because it can handle 800hp stock but the ratios don't match the engine and diff ...i guess it would be perfect for someone who just wants to cruise around.
and also because the a12 won't output as much torque and horsepower to warrant such a gearbox even though its stronger..

On the topic of trd gearsets,Do you have any idea how much a genuine TRD close ratio for a T50 landed in oz will cost you not including labour to fit it in?? The trd gearsets are intended to be paired with with the TRD final drive ring and pinion of 5.375.
You will be able to fit a w58 or getrag v160/161 for the price of an a-series t50 with a trd gearset if you would much rather a stronger gearbox...

and why would a decent gearbox last only for a short time??It wouldn't be decent if it lasts for a short time. Ts cups cars have been racing and running 56a-series boxes from the 1970s both in close ratio 4 speeds and 5 speeds.This were gearboxes designed by nissan omori/nismo for a12 race cars.

and as i stated before, i know some personal friends with rally cars and "weak" gearboxes who have never broken their gearboxes!

Once again,a big percentage of gearbox breakages are due to the driver skill.

Your prob better off to cut and shut a getrag v160 supra or w58 gearbox as opposed to a trd gearset a-series gearbox if your only after strength.