GPG algorithms and key strengths

While GPG supports many algorithms, for best practices consider the following:

GPG key type	Algorithm	Reason
Master key	RSA	For compatibility reasons, consider using RSA as the master key. Some tools don't handle ECC keys properly. Master keys aren't used often; therefore, the speed and size considerations of RSA are irrelevant.
Subkeys	ECC (ECDSA or EdDSA)	Subkeys are used more often. As a result, consider ECC (ECDSA or EdDSA) for its speed; the resulting signatures will be dramatically smaller than using RSA.

GPG key type

Algorithm

Reason

Master key

RSA

For compatibility reasons, consider using RSA as the master key. Some tools don't handle ECC keys properly. Master keys aren't used often; therefore, the speed and size considerations of RSA are irrelevant.

Subkeys

ECC

(ECDSA or EdDSA)

Subkeys are used more often. As a result, consider ECC (ECDSA or EdDSA) for its speed; the resulting signatures will be dramatically smaller than using RSA.