which is more convenient airport in tokyo

The new International Terminal at Haneda Airport opened on Oct 21st, 2010.
With the opening, ANA shifted its international operation from the current terminal. When accessing from central Tokyo by Tokyo Monorail or Keihin Kyuko Railways, be careful to get off at the New Terminal station.

Haneda is the most convenient airport serving Tokyo for customers traveling to or from the city center. With almost 70 million annual passengers, it is one of the busiest airports in Asia, and the fourth busiest airport in the world. It is also Japan's main hub for domestic flights, providing the widest range of options for connections to and from cities throughout the country. With the New York – Haneda service, American will be the only airline to serve both tokyo Narita and Haneda Airports from New York, while the oneworld® alliance will have more flights between the U.S. and Haneda than any other alliance.
In addition to its new service to tokyo Haneda, American will continue to provide service to Tokyo's Narita Airport from New York-JFK, Chicago, Los Angeles and Dallas/Fort Worth. These American Airlines cornerstone markets are also some of the most traveled U.S. – Japan markets. Passengers traveling to or from one of these AA cornerstone markets represent approximately 43% of the Continental U.S. – Tokyo traffic.*
Tokyo-Haneda is preferred by many business travelers because of its proximity to central Tokyo.

"Our new nonstop service to Haneda Airport in Tokyo is a natural addition to our industry-leading Asia service, which continues to grow," said Vinay Dube, Delta's senior vice president – Asia-Pacific. "Delta flights to conveniently located Haneda complement our hub at Tokyo-Narita, and underscore our ongoing investment in the region."

Haneda is now open to trans-Pacific flights this year for the first time in three decades, after being limited primarily to domestic Japan service. The U.S. Department of Transportation awarded Delta two of the four routes available for U.S. carriers between the U.S. and Haneda.