Here's my question.
What is the criteria you are judging? Wins? playoff wins? clutch situations? stats? length of career?
Meredith had a 50% career comp % He couldn't even be a starter on a team today. Aikman career average per game was 199 yards. White, Staubach and Meredith all played in an era that wasn't as wide open and less games a season.
Here would be my list.
Staubach - 85-29 as a starter. 11-6 playoff record 2 SB wins, SB MVP, 6 Pro Bowls, 3rd in 4th quarter comebacks, 2nd in game winning drives.
Aikman - 94-71 as a starter. 11-4 playoff record 3 SB wins, SB MVP, 6 Pro Bowls, most attempts and completions, but also most picks.
Romo - 78-49 as a starter. 2-3 playoff record holds club records for TD's, yards, completion%, YPA, QBR, 1st in 4th quarter comebacks, 1st in game winning drives.
Seventy-five of Romo's 248 career touchdown passes came in the fourth quarter. That's three more fourth-quarter touchdown passes than Staubach and Aikman had combined.
These three stand apart from the rest of the field, at least for now.
Much harder to list the next two. I'd have to leave Meredith off the list. How Brandt has him over Romo is beyond me. Romo has TWICE as many yards passing, TWICE as many TD's as Meredith. Maybe Gil was a fan of North Dallas Forty or Willy Nelson's "turn out the lights the party's over." He did get to the championship game twice, but lost both, one by a bad pick at the end.
I'd have White and Dak a really close 4 and 5. I imagine Dak is going to pass him stat wise in the next year or so, White has the 5-5 playoff record, but Dak will overtake him in a several categories in the next couple years. Ironically, Dak is in the same boat Romo was in at this point in their careers. Pretty good, but still waiting for them to take the next step.