Unless you never want to torrent, I would not choose mullvad. Torrenting requires port forwarding if you properly want to give back to the community, which mullvad doesn't support.

Sadly, mullvad doesn't rotate their IPs so they often get blocked and detected. You're kicked off many websites and services

Nord has no port forwarding. No deal

A lot of connectivity issues in some countries, and the app is often bugged when switching servers