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Advantages of this bus service over Tokyo Shuttle

11 rows of seats vs 12, and this makes a huge difference.
121 services per day vs 113
Lavatory available in bus
Accepts Suica/Pasmo/Icoca etc.
No need to buy a ticket before boarding.
Runs on less jammed Wangan(bay side) expressway (subeject to change depending on the traffic)
Departs from a favorable location, just in front of Tokyo Station.
Ginza bus stop is convenient to connect to/from Marunouchi, Ginza, and Hibiya Lines.

The Access Narita and Tokyo Shuttle may share a bus stop at NRT. Double check before you take the bus.