If you're choosing between RSA 4096 and Curve25519 for PGP, go with Curve25519. It's based on newer cryptography (elliptic curve), offers stronger security with smaller keys, and is faster to use. RSA 4096 is still solid, but it's older and more vulnerable to potential future threats. For more check /d/pgppractice
They're basically the same strength but CV25519 is more efficient (meaning shorter keys, messages, signatures). Check our FAQ /post/e317dc0e6856dc137144 :)