You can't fairly compare actual stats between QB's of different eras. Schematics have changed. The rules have changed and so has the actual football (much easier to throw more accurately and to throw it longer and with more velocity).
I compiled the stats looking at QB's prime and adjusted it based on how they compared to their league average of their era into Romo's era (2006 to 2014).
Meredith - Most underrated of the bunch. Had a high TD %, low INT %, pretty good YPA and higher QB rating. Problem for him was no championships and his career didn't last as long as a lot of HoF'ers.
Staubach - There are other QB's from around the history of the league that I have to get to, but so far he has the highest Adjusted QB rating of *any* QB. Even higher than Brady and Montana. They can call Brady (or Montana or Peyton) the GOAT, but I believe that now we have a serious case for Staubach.
White - Much much better than people expected. Like Romo, high TD % but also high INT % (relatively speaking). He's actually quite comparable to....Brett Favre.
Aikman - I took all of Aikman's career except for his last season. When I took out his first 2 seasons and his last season, his Adjusted QB rating moved up to 93.0. This is why I can now see the importance of winning in the postseason for QB's. Aikman was hurt by his low TD % because when we got near the goal line we almost always punched it in with Emmitt. I was surprised how low his YPA was.
Romo - Is he a HoF'er?
Like everything with Romo..it's debatable and will be debated. His numbers are quite comparable to Terry Bradshaw and Dan Fouts, both in the HoF. And they are better than Aikman's (and much better than Namath's). However, guys like Ken Anderson had much better adjusted stats and took their team to the Super Bowl and can't make the HoF.
I can see both sides of the argument.
My rankings go like this:
1. Roger Staubach
2. Don Meredith
3. Troy Aikman
4. Tony Romo
5. Danny White
YR