ButchA I started shooting the XX78's because at the time they were introduced, they were the only aluminum arrow with the push in nocks. Shooting competition, this was a big asset during a shoot. If a nock was damaged you can remove the broken nock and replace it on the range without any glue and it was perfectly aligned. The 78's will take more abuse compared to the 75's and have tighter tolerance when formed. The XX78 is my choice for hunting and competition and are well worth the couple of extra bucks.