That's a tough one.
The '91 team was definitely a dominant team - I don't think there has been another team that has run the Memorial Cup tournament the way that team did (someone correct me if I'm wrong). I think they still have the highest goal differential in it's history, and if I'm not mistaken scored more goals than any other team has. (Again, correct me if I'm wrong). This team may have been the most talented team to win the Memorial Cup.
On the other hand, the '08 team could be considered underdogs in 2 of their 4 playoff series; and again could be considered underdogs in the tournament going up against Belleville and Kitchener, probably the top two offensive teams in the CHL.
For me, it has to be the '08 boys. They were coming into the season expected to be a team in a growing year. I had them pencilled in to be a 2nd round playoff team this year and perhaps a team that could go deep next year. They changed my mind the weekend they went from here to Kelowna and then Vancouver...3 games in 3 nights with travel, finishing up in the Memorial Cup champions' home building, and we swept the 3 games; shutting out the high-octane Giants. At that point, I knew this team was special and had the capabilities to go deep in the playoffs. Game 71 was a tough one to swallow in Kennewick, and after losing game 72, I knew they were going to bounce back hard. This team showed dedication, and proved that against many odds they weren't going to back down. They weren't the most talented, they weren't the biggest, fastest or grittiest. They were just all of those things put together in big enough doses, combined with heart. I've always had a soft spot for the underdog; and any team that has the guts to do what this team did is #1 in my book.
Spokane Chiefs - 2008 Memorial Cup Champions!!!!!!!!!! punk rock