Which JR ticket is most suite for this Trip route.

Hi,
We (2adults/1kid) are planning to travel Tokyo on 20Oct to 24Oct. I search all information about transportation and found so many option. Could I have your advise about ticket type that is most suite to us, please?

Here is our rough trip plan.

20 Oct
Narita Airport -->> to -->> Shinjuku
Shinjuku -->> to -->> Imperial Palce > Ueno Park > Sky Tree > Tokyo Station > Harajuku

21 Oct
City sightseeing

22 Oct
Shinjuku -->> to -->> Ginza
Ginza -->> to -->> Disneyland
Disneyland -->> to -->> Ginza

23 Oct
Ginza -->> to -->> Asakusa > Nakamise > Shibuya
Shibuya -->> to -->> National Science Museum
National Science Museum -->> to -->> Ginza
Ginza -->> to -->> Narita Station

24 Oct
Narita Station -->> to -->> Narita Airport

+++++++++++++++++++++++++++++++++++ 1) I am considering to buy Suica+NEX (3500 yen), not sure that is most fit or not.
2) I am also considering to buy JR city pass (780yen) for each 4 days, not sure that is most fit or not. Someone said, buy time-by-time ticket is most fit to me rather than JR city pass.

I am very appreciate your advise for me to make the plan smoother. Thank you.
Toto.