i vote for smart.
i transfered already from dawn to theseus (1200 spirits saved per card) and to adam (700 spirits saved per card). its intended by the game and there is a high chance you get white and blue sancts. in any event, spirits are free and pop up random. so even then its over a free random appearing item, no need for an argument.
that being said and with the transfer options, i hope that soon we will pay ONE PRICE in spirits for all heroes in their own category soon. in the tavern its already charging 1 price for gold/purple/blue/white. so we would pay for ANY purple 500 spirits and 1k spirits for any gold hero. charging prices that vary from 800-2000 doesnt make sense anymore.