[benchtest]

Terlaje, Autos are generally more consistent and a bit easier on the drivetrain. Manuals usually offer more gear ratios. So, if you have a very narrow-banded engine, then you will have to use a manual to stay in the powerband. If you have a wide-band engine, then you don't need all those gears (are you old enough to remember big-blocks and powerglides?). Your ability to shift consistently and quickly will also affect the decision to go manual. If you run a turbo car, you'll probably run better with an auto, as it will stay spooled between shifts. There are many factors to consider.

Andydg, A trans-brake engages 1st and reverse at the same time, locking the transmission.