It's also easier to fit a tensioner to keep the wheel in the same place under high torque riding with a track end than a horizontal drop out. And if the wheel does slip it can't pull out of the dropout on a track end so that's arguably slightly safer.
It's also easier to fit a tensioner to keep the wheel in the same place under high torque riding with a track end than a horizontal drop out. And if the wheel does slip it can't pull out of the dropout on a track end so that's arguably slightly safer.