in my experience, it is really personal preference, and for instance, the way my bow and rest height is set up, i cant use anything but mechanical. I was talking to a gentleme once that discouraged mechanical because of the extra kinetic energy the broadhead has to go through when hitting the deer. And when taking a a far shot, that could make the difference of a double lung penetration and single lung.
I know that isnt too much, but hopefully it can open your opinion a bit. happy hunting!!