I vouch for DeepOnion because it offers anonymous transactions and I value privacy.
DeepOnion is natively integrated with the TOR network, allowing to send and receive $ONIONs over the TOR network.
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.