If you live in Tokyo, both airports'd actually feel equally important, if Haneda weren't the most important..
After all, RJTT made a new international terminal with flights going as far as Frankfurt and even New York!
(Now if only they fly to Washington DC, or even Raleigh/Durham...)
EDIT: There's a model I'm making for both RJTT (Terminal 2 and the International terminal) and RJAA that I touch up on when I find the time. So considered those airports covered, please (even though I haven't formally advertised it yet..).