Berkshires share classes are different in that A is exactly ten B shares and anyone can convert A to B and hold them. The dual share classes that are bad separate control from ownership.

The BRK A and B are slightly different in that A is worth 1500 B but B only has 1/10000 of a vote so it IS a somewhat lopsided value vs voting share but not as bad as the 0 vote SPCX shares that just got dumped on the market.