Very likely is not a realistic answer. I don't know if the non names are better or worse but I can tell you I purchased this no name on Amazon 4 months ago and they fit perfectly and have protected my Z Flip from minor falls. They have not slipped off like other cases I have read on posts here. Good Grip and I"m a happy camper.

The RIngke slips off the phone. Read the reviews. I purchased this one. I"ve had it for 3 weeks with zero problems! Click here..

I have used this one. Its cheap snaps on the phone and has not moved a bit but it does not have a ring: Click Here: