I've tried both. The dish soap is 100% satisfactory. The laundry soap I'm not yet sure about because I tried it in a few loads but then went back to finishing the two open containers of other brands I already had so as to reduce clutter in the laundry room! I have a feeling it may not rinse out completely because of the way the wet clothes feel, but they are not actually sudsy and I haven't noticed any film on them.
As for fragrance, my Costco only has unscented and citrus. I like the smell of the dish soap. The laundry soap is slightly strong and flowery for my tastes, but the smell fades after a couple of days, and it does help to keep things smelling fresh in my musty
: closet. I've learned not to buy lavender-scented natural products because they too often smell like mud.
KayleeZoo, are you sure your friend uses the Kirkland NATURAL (plant-based) detergent? It's been available less than a year, at least here in Pittsburgh, so I wouldn't think that's enough time to make a visible difference. Do you know if your friend washes in hot water while you wash in cold, or line-dries in the sun while you dry another way? Those things can make a big difference in fading.