Surprised more people haven't responded:
Questionable quality:
Lv good but gets dirty looking and some of the plastic part wears in the corners. Also I have seen neverfulls with the side leather missing and the top leather cracking
Stella McCartney had a seasonal bag that fell apart the first day.
Coach: had bags fall apart in a year
Fendi bags have disintegrated over time
Gucci friends wristlet fell apart within the first week.
Chanel- while durable and love it, I have found loose threads and pealing leather in fairly new straps ( I want it to be great but not sure however the fix all issues without a problem so that moves them up.
I haven't found a perfect brand yet but so far I think Chanel and lv are the best for me. Service when something goes wrong is important and they both stand by their products.