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Read the Blasiola book. I think most of the questions are answered there. (I know, I just won't make it easy. Always frustrated my daughter, too.)
As to which are the most popular? I don't believe there are any published figures. Still, I'd say more Ogons are sold in the U.S. than any other recognized variety, but probably more unidentifiable "pond mutts" are sold in pet shops for under $10 than all the identifiable varieties put together. Why? Because they are cheap and still give much of the pleasure of koikeeping to their owners ... but not all. That comes from appreciation of the varieties. (Now that could cause a debate on another board known for splitting hairs. Why? Because even "pond mutts" can forced into hikarimoyo or kawarimono or doitsugoi B. Read Blasiola to figure out how that can be.)
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