boosted, allmotor, electric-powered, or any other method- the shorter the tranny, the quicker acceleration.
but, there comes a time when street-drivability comes in to play, as well as traction.
IMO, the best all around tranny for a street turbo car is a gsr w/ a quaiffe LSD installed.
the best tranny for a track-only car is an itr or b16 with a quaiffe lsd.
the only time i would recommend the LS tranny to anyone would be if they wanted to do 180+ mph on the street- and thats just stupid.
tire size comes into play a lot too. thats why drag cars running 28" tall slicks (as oppoped to the 22.x of the average 205/50/15) can still run the tight tranny of a b16/itr and still hit 160-170mph