Purely aesthetic, AFAIK
. Where is the bass? Where do you live? How long has it been at this location? Is it carved? Any cracks apparent? One worry is green wood cracking under changing humidity. I would not buy a bass without an opinion from a 3rd party bass luthier.
A former student had an upper end Paesold which was very nice. I think you can buy a Paesold or Shen with confidence, but you still have to watch humidity levels if you live in cold winter climate.