Cross wrap is wond like a stock while the "normal" is like a mod.
Basically, you have to have the right arm for your motor can otherwise it spins the wrong way. Some C2 cans have 2 timeing lock holes which allow the end bell to turn 180 to fix this.
The cross wrap is easier to make from trinity's view, hence why it is used in stock. They other way, hemi, i think its called, should be faster but, there is very little in it.