(Carl from Obscura here)

Other than the obvious hassle? XP

If you connect to Mullvad over NordVPN:

- You're giving both Mullvad and Nord some payment information (with Obscura you only give that to us, Mullvad has no idea)

- You don't get our QUIC-based obfuscation (see more here: https://obscura.com/blog/bootstrapping-trust/)