Definitely BCC or XBC as stated on the bitcoin.org website. BCH was created to slander Bitcoin Cash and I will not use it.
If we want to differentiate from Bitconnect then we should start to popularize XBC.
Bitcoin.com is just one domain name used to promote Bitcoin. Bitcoin.com is not an official website. Just like nobody owns the email technology, nobody owns the Bitcoin network.
As such, nobody can speak with authority in the name of Bitcoin.