Ceramic and quality are not 1-to-1. Ceramic only refers to the material. There is a lot more that goes into a bearing besides just the material the bearings are made of.
To startoff with, smoothness (i.e. the ABEC rating) differs even among ceramics. You can easily buy cheap ceramic bearings with low ABEC ratings. They'll be cheaper than steel with a high ABEC rating.
There are also tons of hybrid ceramics. In other words, the race is made of steel while the balls are ceramic. Is it considered a ceramic bearing if both the race and balls are ceremic or just the balls? It's a matter of marketing.
That being said, ceramic is lighter and does not rust, unlike steel. Corrosion resistance plays a role in bearing longevity so ceramics can last a little longer in that regard.
Bottomline is, if it says ceramic, take a closer look. Not all ceramics are the same.
Rob