Is there a reason they grab their boot differently?

I have been working on a needle spin an have it pretty consistently but i have noticed that Kamila an yulia both grab their blade differently, Kamila seems to almost grab towards the side of her head around her neck an yulia grabs directly behind her head is there a reason that they do this or is one better or more efficient than the other? I’m trying to decide which way to grab when spinning i can do both just don’t know which one to stick with