For me it has to be Live it Out. This was when I first got into that indie pop sound. This album resonated so much for me. The choruses just get stuck in my head forever.
I listened to Synthetica on repeat for like a month when I first starting listening to Metric. Still love it.
For me it’s Synthetica with Fantasies a close second. I need to see them again! I only saw them once, but they were fantastic: Metric Setlist at House of Blues, Cleveland