Chip+PIN is the “strongest” encryption method since it’s much harder to steal a PIN than fake a signature. Currently, most US banks issue Chip+Signature cards. As time moves on, they’ll migrate towards Chip+PIN.
EMV, otherwise known as Chip Cards, are the new payment technology adopted by the card associations. You’ll also hear it called “Chip and Pin” or “Chip and Signature” – but not matter the moniker, it’s important that all in-person merchants accept EMV transactions.