A/T strictly for drag racing.
Advantages:
- consistent, hard launches from brake torquing (and building boost at the line)
- fast, WOT shifts (not sure about Supras, but may need some type of shift kit for higher line pressure during shifts)
- always in boost down the track
- no missed shifts
- less stress on drivetrain (due to fluid based action of auto tranny)
Disadvantages:
- additional weight
- additional drivetrain loss
- with larger turbos, higher stall torque converter would be needed to build boost at the line
- people saying "oh, it's auto" in a disappointed way :icon_bigg
For a street car, I prefer a manual. And that's coming from experience with both (Talon is A/T, Supra is 5-spd).