My somewhat controlled conditions:
3 people use my shower - myself, my daughter and the youngest son
Youngest son will only use unscented soap, so mostly he uses store bought body wash
Daughter will only use soap of particular "girly girl" fragrances
I am an equal opportunity soapist, so if it's in my shower I use it
Knowing this, last fall I compared a bar that I made with 95/5 with a 100 bar - same recipe, relatively same age (within 2 weeks of each other), chose fragrances that I knew my daughter wouldn't use (and being scented the son wouldn't touch at all), and put them in the shower at the same time. I alternated between the bars. The 95/5 used up faster - but one thing that contributed to this was that it also lathered quicker than the 100 bar, and being a creature of habit I lathered for the same amount of time, rather than stopping once I had a reasonable amount of lather to do the job. And yes, I cussed myself out every time.
That said, really the difference between the two bars life was that the 100 bar lasted approx 5-7 washings more than the 95/5 because of the way I used the 95/5. For me this was pretty negligible, so I do make some of my soaps with 95/5 (new fragrances, my old fragrances that I've been making for years stay 100) and customers have been happy with how quick they lather - to the point that they mention it. They do not mention that it doesn't seem to last as long, so either they do not have the issue that I had, or this isn't a concern for them.
As we all know in the soap world, these factors can (and do) vary greatly based on soap recipes, adjuncts, etc., so my experience with my recipe may not be repeatable for you in your recipe. I would definitely do a small batch test. I tested my 95/5 at about 5 weeks cure (the 100 bar was probably 7 weeks). I have not compared how they age - at 12 weeks, 6 months, etc. I'll have to check my records, I might have two batches that are close enough in age and well aged to do the comparison with, and I do have a couple bars in the shower that are almost gone... thanks for bringing up this topic, it's a comparison that would be good for me to revisit myself.