I worked in ball-bearing manufacture for twenty years.
In terms of motorcycle wheel bearings, we are discussing "radial ball bearings".. (for the steering head, those would be "thrust ball bearings" or possibly taper bearings).
All Balls has carved a name for themselves by flooding the internet (mostly Ebay) with all their offerings, so many people who don't often deal in bearings have just assumed they are a Big Name somehow.
The big names in the world are:
SKF, Timken, NTN, FAG, NSK, NMB, and a few others, who produce name-brand respected quality.
MOST bearings are made in, yes, China. Almost all the big companies have joint-venture factories there. And, (other than ones possible national sympathies), that's not always a bad thing, as long as they are produced under strict western Quality controls.
ALL BALLS appears to be just a distributor, not a manufacturer. They most likely buy their bearings from Chinese sources, (which most distributors do), and again, that isn't always bad, if the manufacturing Quality is being tightly monitored.
But keep in mind, the cheaper you go, the the more likely of running into a quality defect. There are MANY MANY Chinese bearing manufacturers, and they are all in tight competition with each other to provide LOW PRICE.
Cheap bearings run the risk of: steel chemical flaws, surface finish problems on the raceways, heat-treat (hardness) problems with the balls...roundness issues...insufficient grease in the assembly.. weakly-joined "cages" (ball separator), etc.
Any of these can lead to premature wear and failure.
I worked for a US bearing company for ten years at their joint venture factories in China.
One day I mentioned to a good-friend Chinese businesswoman I knew.. "You do understand that most of the world regards Chinese product as "sh*t, right?"
She coughed delicately and said, "Your businessmen come over here wanting to PAY "sh*t" money.. so they get what they pay for. If they want Quality, it's available".
Sooo... I'm out of the industry now.. but if I want good wheel bearings for my bikes, I go to a local bearing supply house, give him the OD ID Width sizes, plus whether it has seals... and then ask for a good brand name (see above).