And then there are the Amazon reviews which seem to be done mostly by the sellers. Sometimes the sellers offer a rebate to buyers for a 5-star review. You can get some info from those reviews but you have to read them very carefully, and especially pay attention to the 1-star reviews.Many of the "top blah blah" lists are done by automated gathering of top sellers or reviews from sites, not people that actually look at the item and compare it. ....
As for my stiff-backed roller-duffel, I got one that had a good warranty. I took it back once when the baggage system broke the base so it could no longer stand up on its own.
In my latest baggage problem (UK Open), it seems that the baggage system managed to drag the wheels sideways -- maybe across the runway -- so both wheels have serious flat spots. Time for a new bag.