User blog comment:Silver-Haired Seireitou/Revisiting Hakuda/@comment-1493741-20150516093556/@comment-2089817-20150516162538

Well, the reason I find that reiatsu works better is because it is more personal to the user.

Reiryoku is just neutral energy. Every person has it, it is latent power, raw energy, and if it isn't in use, you really can't call it your own. Reiatsu is when that energy is put to use, commonly manifesting in its pressure that rains down over the entire area. That's why reiatsu can be elemental, it can instill fear and dread into the enemy, it can be classified as "Hollow Reiatsu" for instance. I don't care what Bleach Wiki says, because if you look at the manga and at the anime, terms like "Hollow reiryoku" or "fire-elemental reiryoku" and the like are never actually used. Because you can't tell what a person's reiryoku is, because it's just energy. Ichigo's Getsuga is reiatsu, not reiryoku as many would believe, and I can prove this because of two points: one, Ulquiorra remarked that the technique is a lot like Cero, which is a reiatsu attack, and two, when Ichigo struck Aizen with Getsuga, the remnants of the attack was commented upon by Aizen when he took it by hand and remarked upon the "strong reiatsu" that matured as he wanted it to.

And for Hakuda, which is the expression of personal conviction, resolve, and martial spirit, a personal form of power like reiatsu fits way better. And it becomes more convenient to do so because reiatsu can't be easily taken away, nor absorbed by an enemy. Quincy can absorb reiryoku, because a lot like reishi, it is a neutral energy; a fragmented energy with no drive or purpose or direction. When reishi is given direction, you yield Kidou. And when reiryoku is given direction, you yield reiatsu. I find that explanation works best, but that's just me.