Xenon makes the TA05 bulkheads also.
My experience has been that a spool is easier to drive on low traction surfaces and tends to make the car tight when
the traction comes up. The one-way works well on medium to high traction smooth surfaces. If you can get the one-
way to work, its usually a little faster because corner speeds will be a little higher.
Of course this all depends on driving style.
The spool tends to be better for an agressive driving style (drive deep into
the corners, brake and throttle out).
You can't lay into the brakes very hard with a one-way. So it favors a
smoother driving style that uses less brakes.