Imagine if you rented out a home that you host parties in. People love coming to your parties so all is well.
But then you find out the old landlord sold the house to a new landlord who is now making changes that make it more annoying for you, like not fix things that are broken or require you to park your car down the street for no reason.
Then they decide to move you out of the home in a few months. So you decide to go build your own home and just host the parties there.
THAT is what hearthpwn is going through. It's less about money and more that the folks of Curse, who own the underlying site, don't really care much.
The folks ofoutof.cards are the folks who have been maintainiing hearthpwn and keeping it going who are about to get kicked out. They have been working on a new site for a while now in preparation and decided to officially mark that this is where the new party is. It'll be owned by themselves and not by folks who don't give a care and, thus, will be easier for them to manage properly.
So it's not so much two hearthpwns as it is one heathpwn that's shutting down and a new better place coming up in its stead.
As far as wher to go.. just go there and call it a day basically.