Mullvad is trying pretty darn hard to be as far from "just trust me bro" as is feasible. If you do take their word for how they run their systems (/are working toward), their servers are diskless (what logs?), will only run software signed by their infrastructure team, and will remotely attest that their software has not been tampered with.
This is so very, very, far away from the typical VPN company that any such comparison sounds ridiculous to me.
Just the pretense of doing all this work costs so much that a greedy biz bro simply wouldn't.
https://github.com/mullvad/system-transparency