choose "RSA" and set the number of bits in the key to 4096.
Why I don’t Use 2048 or 4096 RSA Key Sizes – Simon Josefsson's blog
it is usually better to use the Elliptic Curve technology algorithm Ed25519 instead of RSA.
See also https://www.brandonchecketts.com/archives/ssh-ed25519-key-best-practices-for-2025