[throwaway2037]

    > Haneda is vastly more convenient.

Many (millions) would disagree. After the opening of the Keisei Skyliner[1], a very fast train from north Tokyo to Narita, from Shinjuku station (west side, busiest train station in the world), it is the same time to either Haneda ("Tokyo Int'l") or Narita.

[1] https://en.wikipedia.org/wiki/Skyliner

[lobochrome]

I prefer to take a taxi. Also 99% can’t choose. Either you‘re on premium market destinations and carriers (JAL/ANA/LH) or you have no choice to go to NRT.

[SSLy]

and if you're not in a big hurry you can just ride the metro-through line that might be slow but certainly scenic.