I'm no expert but I think the big difference here is that the trans brake will allow you to build boost pressure at the line before you release it whereas the brake torque method usually results in little to no boost buildup before you start spinning the tires. dunno
That's why I'm thinking that the brake torque method might be better for lower 60' times, you are loading the whole driveline including the tires and there is less "shock" when the brake is released. As you get close to the boost hold limit the tires are just starting to turn and are loaded whereas with the trans brake they see no torque until the shock of release.
This asumes you can build adequate boost against the brakes.
There may be some that have gotten better 60 fts off the brake but I believe the majority will state that they get the best 60 fts with a trans brake...including me...I couldn't launch worth crap off the brake no matter how many times I tried...plus the fact that I was unable to hold a lot of boost...with the trans brake as was stated there is no limit to the boost you can launch with...other than things breaking...besides knocking a tenth off my 60 ft I get consistent launches/60 ft times every time with the transbrake...off the brake I was all over the place...I'll never go back to launching of the brake...