Forced into it, I’d prefer the Borg. They don’t have too bad a life, and they look badass.
Voluntary upgrade. Ghost in the Shell cyber-body - Full on Major Kusanagi-style ‘down to just the brain’ level cyberization. Sweet deal - immune to sickness, minimal neccessary downtime, extra-resistant to damage, super-strong, ability to jack into electronic devices (well, other electronic devices), and a choice in appearance (not even only a 1-time choice, either…getting a new body is possible, if not cheap). Sure you’re open to ghost hacking, certain computer viruses or having someone like the Laughing Man mess with your perceptions, but in GitS-land, that’s a danger even with the most minimal cyber-enhancements, which almost everyone has.