Question about ssh key generation

[Bruce Labitt]

Gitlab is asking for ssh keys now.  Is there a recommended type of key 
these days?

man ssh-key gives me the following choices:  dsa | ecdsa | ecdsa-sk | 
ed25519 | ed25519-sk | rsa

Which should I choose?  Which ones offer the longer/longest key length 
(best security?)

Sorry for the simplistic question, not done this before.  Any insight 
would be helpful.