Comment by qurren

Lots of other differences.

1. Citizens have a right to enter at ports of entry, can refuse to hand over social media accounts, etc. Greencard holders are still at the discretion of border officials.

2. Citizens can wander the world and live abroad for however long they fancy and always be allowed to return to their country of citizenship when things go awry. Greencard holders can't do that.

3. Citizens get consular protection, greencard holders don't.