It's funny how these debates play out. It seems to me that people have difficulty separating personal feelings from objective reality. McNabb was a great QB for a lot of reasons, particularly the fact that he was very careful with the ball and he could supplement his deficiencies as a passer with amazing running ability. But how was he a better QB?
Win%: McNabb 60.4 | Romo 61.1
Cmp%: McNabb 59 | Romo 65.3
TD%: McNabb 4.4 | Romo 5.7
INT%: McNabb 2.2 | Romo 2.7
Y/A: McNabb 6.9 | Romo 7.9
Rate: McNabb 85.6 | Romo 97.1
Sk% McNabb 7.7 | Romo 5.4
Except for Win% and Int% those numbers aren't even close.
The entire argument in favor of McNabb seems to be playoff wins. That seems like a pretty narrow argument considering it's a team game. In McNabb's career playoff games the Eagles defense averaged 5.7 in PTS and 9.4 in yards. Are we really giving McNabb all the credit for those wins?
Here is the breakdown:
2000: 1-1, 4th PTS, 10th YDS
2001: 2-1, 2nd PTS, 7th YDS
2002: 1-1, 2nd PTS, 4th YDS
2003: 1-1 7th PTS, 20th YDS
2004: 2-1 2nd PTS, 10th YDS
2008: 2-1 4th PTS, 3rd YDS
2009: 0-1 19th PTS, 12th YDS
For Romo OTOH:
2006: 0-1, 20th PTS, 13th YDS
2007: 0-1, 13th PTS, 9th YDS
2009: 1-1, 2nd PTS, 9th YDS
2014: 1-1 , 15th PTS, 19th YDS
Romo's defenses averaged 12.5 in PTS, and 12.5 in YDS. One notable difference is that Romo was actually able to win a playoff game without a top 10 defense in either metric.
I have said this in other threads but the stigma of the botched PAT vs Seattle unfairly stuck with Romo for his entire career. He was one of the best QBs of his generation and barely gets a modicum of the respect he deserves.
One last note is Romo's Cowboys went 4-4 against McNabb's Eagles head-to-head during the regular season and Romo's Cowboys beat McNabb's Eagles 34-14 in the 2009 Wildcard game closing the book on McNabb's career in Philadelphia.