According to the most recently generated odds, the Denver Broncos are the favorites to win Super Bowl XLVIII over the Seattle Seahawks, but not by much. Oddsshark.com, which aggregates different odds makers' number, has the Broncos as a 2.5 point favorite over the Seahawks. The site also lists the game's over/under total score for both teams at 47.5.
But it's really too close to call. A clash of the league's best defense with the league's best offense. In fact, it's a match-up of the best offense in NFL history with the 10th best defense in its history, so the odds makers are definitely not having an easy time with this game.