Based on QB's alone... I would take Favre over Romo this week.
It has been a long time since Favre has had the kind of support players that he has in Minnesota this season. He had been forced to carry a depleted Packers team and did the best he could with that situation. His then comments about that last Packers squad he led into the playoffs were very accurate. They were young and it was a suprise to see them get that far. When he left they dropped of quite a bit the next season. Then he led the Jets to one of thier best seasons in recent years before playing with a damaged THROWING arm the rest of last year.
Now on the Vikes he has the ability to adjust to his teams performance. If the run is working, he is more dangerous. If the run is not working, then he has the Favre-ness to take over the game with his somewhat healed arm and lead them with a passing attack that included Peterson out of the backfield.
Let's face it, no matter what you think of the guy, Favre is a still-playing NFL Legend. And whenever he is on the field he has the opportunity to lead a team to a win and people WILL watch.
Romo is.... well... Romo. He is having his best late season performance ever. But lets examine the overall dynamics of this success. The Cowboys defence has played extremely well this season. But the truth remain that the Cowboys will only go as far as Romo can take them in the passing game. The Dallas rushing game is NO powerhouse and NOT the strength of thier team. The burden for victory is on Romo's back. In the last two games vs the smoke and mirror Eagles, Dallas was able to run at will. This will not happen vs Minnesota. In the Saints game, Romo benifited from a seriously weak Saints secondary and he will need the same success vs Minnesota.
The only way Dallas wins is to contain Peterson, protect Romo, and force Favre to try and beat them while getting pressure on him. If they follow the routines used recently by AZ, Carolina and the Bears then Dallas has a decent shot at the win. The Vikes woke up in the 2nd half vs the Bears but to little too late. Note however that all 3 of these Vikes losses were on the road.
Minnesota is thin at the linebacker position so Dallas would do well to exploit this weakness with a short passing or dump pass game. Screens and misdirection plays would be good ideas also for Dallas.
For the Vikes it's simple. Run the Ball Well or Else. The Vikings need a productive game from Peterson to keep pressure OFF of Favre allowing him to pick his spots to throw. If they can not run, then they MUST get Peterson involved in a dump and run game. They can not rely on Favre to have a big day chucking it downfield which leave him open for sacks,fumbles and int's.
Keys to the game in a nutshell...
Minnesota: Must control Romo with a successful rush and prevent him from having time. Force Romo to be the Old Romo.
Dallas: Must contain Peterson in Running and Passing plays to him. Force Favre to try and make plays and get pressure when he is in that situation.
With that said I'd back Favre who has more weapons over Romo who has less big game history success and is playing on the road.
We will have to wait and see how the scenario's unfold but this is my GOTW to watch followed by Jets/Chargers as my #2 must watch game. I think I'll just sleep through Saturdays games.
I like the winner of this Dallas/Minn game to represent the NFC in the Super Bowl and will be pulling for the winner of the Jets/Chargers game to make it there as well.
Good Luck To All.