Tinstaafl,
The 45/180 reversal turn is that chosen as the standard for illustration on the approach plates. PANS-OPS indicates that the 80/260 reversal is still an approved alternative.
There are definite limitations upon the 45/180 turn, at higher speeds (I recall about 180 Kts) overshoot of the inbound QDM is guaranteed, something that cannot happen with the 80/260 turn (Of course, a strong crosswind can play havoc with both of them).
Regards,
Old Smokey