Brees is better, but the Giants don't need to play Saints style of football to succeed. This team is built on Road Warriors mentality instilled in them on February 3, 2008! Playing outside of their home zone is NO PROBLEM to this team. The Saints away from their dome are automatically at a disadvantage.
Although, Eli can be a bitch at times. Eli is the type of bitch to not risk his body running for extra yardage, but he's definitely not a bitch when it comes to standing in the pocket and taking the big hit to make the clutch throw. Overall, very smart quarterback. You only wish your qb was half like Eli Manning.
EDIT: Drew Brees and the Saints team live and die by the big play(s). The Giants and Eli Manning don't need to worry about that to make their offense function. Totally different teams, and I do think Drew Brees leads the league in big plays. Not only that, but this Giants team's defense actually has a vibe. Not sure if you can say the same about the Saints' defense.
EDIT 2: Having said all of that, I DON'T think this game will be easy. The Niners are here for a very good reason, and you can't just overlook them or the home-field advantage. I believe in Eli and this team when they get this far (not if they were playing the Saints, though
)!! This team is ACTUALLY looking good for a change. Consistency will be key, which is something they lacked all season long.