> When I run `ssh-keygen`

As of OpenSSH 9.5 the default has changed, so you don't have to specify anything:

   * ssh-keygen(1): generate Ed25519 keys by default. Ed25519 public keys
     are very convenient due to their small size. Ed25519 keys are
     specified in RFC 8709 and OpenSSH has supported them since version 6.5
     (January 2014).

* https://www.openssh.com/txt/release-9.5

Use shell autocomplete. Even `bash-completion` suggests arguments for the key type these days:

  $ ssh-keygen -t <TAB>
  dsa   ecdsa   ecdsa-sk   ed25519   ed25519-sk  rsa 

`-sk` is short for "security key" if memory serves me right, and is used with FIDO2 hardware tokens.