While he price will always drop on any mutations (supply and demand) recessive however will maintain their value longer and it is the case for both of those now the key to sell and make a return is to go beyond single gene pieds or single gene clowns.
If you want to know which retain their value better you obviously want to make a return whether it is for your collection to pay for itself or make extra cash and in that case you will have to invest, upgrade your collection, and know the market, but most importantly you should be passionate and work with what YOU like.
I mainly work with both clowns and pieds and if I had to pick one I would pick Pied simply because I prefer them over clowns even though Clown combos do command higher prices.
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