The Arasaka path is a trap. You either get digitized like Johnny, literally signing away your humanity in the process, or you go back to earth with a 6-month death sentence because the chip damaged your brain irreperably. (Yorinobu switches to Engrish in this one. Likely a deliberate choice to drive home that he's proved himself a failure, but it's too jarring. No need to kick the guy while he's down.)
In the Nomad ending Saul is killed by Smasher. He barely shows up in the game, admittedly, but it's a shitty death for a good character.
The Nomad epilogue is the most hopeful, especially if you've romanced Judy or Panam. You're still dying, but at least you're not an empty shell of a human being chasing meaningless fame.
The secret ending is a gauntlet. Just you and Johnny with some help from Alt (not as much as with Rogue's path). Your health is ticking down, you can't save, no checkpoints.
If you go back to your body, you get the same Path to Glory epilogue as with Rogue. None of your friends die, but you still treat them like strangers. (Judy's break-up call is just sad.)
If you choose to let Johnny take over, he ends up leaving Night City, seemingly a changed man (in a woman's body, possibly). The voice mails in the credits imply he's ghosted everyone from V's life.
It's unclear if V's brain is toast in this one, but I assume that it is. Arasaka doctors talk of removing tumors during that ending. Maybe the nanites in the chip can complete the transformation? But even Saburo needs a genetic match to make it work for him, so I doubt V/Johnny will fare better. Unless this follows the fiction cliché of prototypes being much better than serial production models.