Originally Posted by
rdurlabhji
Figure if I get there at 9 AM I'll have time until about 3 to explore.
If I hadn't been to Tokyo proper before, I would go there. IMHO, that would be enough time if you took the train and still have time to do sightseeing.
I've been to both, but only Narita was a layover. Spent about 3 days in Tokyo itself and really liked it.