Jeremy : I find the notion that one watches football "objectively" a little absurd. (Actually, a LOT absurd.)
Yes, I am very biased toward the Denver Broncos having been a fan since they lost in the Superbowl to the Cowboys. As a longtime fan who experienced the range of emotion with the 1980's Elway super-bowl appearances and losses, and finally seeing my team win the ultimate prize was a euphoric experience.
The "life-message" to daily do your best work and someday you too can be at the top, is very inspirational. I still get a lump in my throat when I watch reruns of that game. John Elway's perseverance in that game, in which inarguably the two best quarterbacks to ever play football, go head-to-head, is a constant and timeless reminder for me to work very hard and do my best in practicing my life's vocation.
So for me, it is the best super-bowl of all time because of all it represents, inspires, and symbolizes. Am I biased? Absolutely, and proudly so!