I like looking at goals against/60 relative to teammates, while also considering zone starts/quality of competition.
Not perfect, but if you have a good goals against relative to teammates while also taking on tougher zone starts/QoC, it's indicative that you're an above average player defensively (or at least on an above average line defensively). Conversely if you have a high goals against relative to teammates while also getting preferential zone starts/QoC, it's a good indication you're not good defensively (or at least on a poor line defensively).
Like others have said, there's no particularly great stat in hockey though. Whatever stat you're looking, whether it's corsi or whatever, I think trying to give it a bit of context with zone starts/QoC can be helpful.