Which senetnce do you seems most correct gramtically?

[Anonymous]

1. Miserable people are envious of me because i have a happier life than them.

2. Miserable people are envious of me because i have a happier life than they do.

[CupcakeTheDestroyer]

The second one is correct grammatically but outside of a formal setting both can be used without issue

[Aubrey97]

Neither are incorrect but the second one is better. I would suggest replacing have with live though.

[Sarah2007]

No difference you can use both