I disagree that the Gramercy is better than the Nokia. (Can't call it BB, yet. That name change is such a disapointment. I'll go by the addy.) The Gramercy is very narrow and unless you get there early, you get stuck in the rear unable to see anything (short people that is). Also I don't like those scuzzy, steeply vertical seats in the rear. The seating area at 1515 Broadway are much nicer if you choose (or have) to sit, and you can't beat the concourse there for socializing. I've heard the sound at both ends of the spectrum in both venues. I prefer the layout of Irving Plaza, but I've been disappointed with the sound there more than the other two. Guess it's just a matter of personal preference.
From a photography point of view, the stage at 1515 Broadway works much better. I've never had any trouble seeing the bands there even from the rear.