[cypher]

The main differences between the two species are Campbell's have slightly smaller eyes, bigger ears & a more pointed face while WW have larger eyes, smaller ears & a more rounded head with a "roman nose", other than that the main difference is colours, Campbells come in a wider range of colours.
As for personality type differences I think as with most species that really depends on the individual.
Do you have breeders near you? I thought that WW or Campbell's breeders were quite rare in the US.
Hybrids can look like either species, there is no way to tell just by appearances so unless you know a good breeder who can give you the history of a hams parentage then you can be almost 100% sure any Russian ham will be a hybrid.