Well, I don't know if it's better, maybe if you're undecided it's best to try several poses first but practically speaking, you'll still have to tweak the pose after dressing your model. Most poses are created with unclothed models so clothing them might give you some collision with the clothes, especially if the hands are on the hips. Sometimes the clothes mesh may not be so hi-res and forcing it into an extreme pose will cause breakage, twisting (especially in the chest) and not to mention footwear with heels being the main reason for having to refine the pose. So, basically you can pose your model whenever you like, just be prepared to do the necessary tweaking after you conform the clothing. Needless to say in the case of dynamic clothing in P5 you HAVE TO clothe them first in order to do the animation to pose the dynamic clothes.