I believe this is mostly a personal preference on how to setup your normal mode. There are advantages and disadvantages on both depending on what type of flying you will be doing.
Hover at midstick
Advantage: Better feel for precision hovering and AMA/FAI style flying.
Disadvantage: Awkward transition to 3D or stunt mode.
Hover at 3/4
Advantage: Preferred setup for those who mostly fly 3D. A must use on Idle up setups with V throttle curves or pitch range of +10 top, to -10 bottom, with 0 degrees at midstick. It will give you a smooth transition going into and coming off Idle up.
Disadvantage: Less precise hover for normal mode since you are cramming more pitch variation in less stick movement.
Although most of my flying today is 3D-ish, I personally like the1/2 stick hover for normal mode, it helps me when I mazoquistically practice precision hover stuff.
Hope this help