Ceramics are cool but they have longevity issues and are very expensive.
I wouldn't use them for a bike I wanted to have around a while.
OEM or Quality US, Japanese, German, or Swiss bearings is all we want to use in our builds unless there is no other option.
Hrrrm..! SKF was a Swedish bearing manufacturer the last time I checked. Funny thing with the above pic, a few are made in France, then there's Argentina, Indonesia, Malaysia and Argentina. But rest assured that SKF wouldn't put its brand name on any sub standard items.
Another interesting thing about engine bearings; an OEM Koyo or NSK main bearing of the same designation as a standard off the shelf quality brand counterpart, for example a 6305-C4 oftentimes have a different number of balls. I have seen main bearings for a 2005 Suzuki RM250 with 7, 8, and 9 balls in them, from KOYO (OEM), SKF and Hot Rods (probably Chinese)
I always use OEM main bearings for peace of mind. The Japanese are extremely good at what they're doing.