Historically I would say that Detroit's biggest rival was Montreal, which now exists as the Carolina Kraken. Things have felt different since the rebranding and relocation. I guess by default that would leave St. Louis as the biggest rival for Detroit. Still, while things with STL may be taken a little more seriously than with other teams, I can't recall a rivalry that really matched the Detroit-Montreal one during my time in the SMJHL. The teams had existed in the same conference since the SMJHL only had 6 teams, so naturally there were many tough matchups played in the postseason over the years. I can fondly recall a time where Detroit, down 0-3 in the series against Montreal, made a change at goalie and continued to reverse sweep Montreal. It led to some pretty funny meltdowns. With St. Louis at the bottom of the standings and Detroit near the top, you could say we are sitting pretty in our current rivalry standing.