My take on it (for what little that's worth) after also having had further time to think about it...
Stats aren't everything, not by a long shot. But they do have their place in trying to determine one player's skill level... one player's strengths and weaknesses... versus another's. They don't tell the whole story.
Winning Super Bowls is about t-e-a-m effort. Always has been. Always will be.
Any individually dominant player on a team can help keep their team in the hunt and even help them get to the Super Bowl, but it takes an entire team effort to win it all, especially throughout the Playoffs and on through the Super Bowl.
I believe Tony Romo is the better overall quarterback — head-to-head, all outside influences being equal... which is never the case — when compared to Eli Manning, up to this point. Such an opinion is near impossible to prove, especially to anybody who has an opposing opinion on the matter.
Still, neither QB's entire body of work has been turned in yet, assuming each of their careers continues for a few more years. When all is said and done, maybe the picture of who was the best will be much clearer. IDK.
But would I rather see the Cowboys have more Super Bowl rings, like Eli has, or Tony Romo's studly stats (as I think someone put it) at quarterback? Well, that's a distinctly different discussion point than the one raised in this thread, IMO. To that question my answer would be, I'd rather have the SB rings, but I can't disrespect Romo's efforts in having tried to get us there, mistakes and all.
And like I said — still hoping for SB successes in future w/ Tony at the 'Boys helm — the whole story hasn't been written on Tony or Eli just yet.
For now, I think Tony Romo > Eli Manning. That's just my opinion. I'm unapologetically stickin' to it.