IC Card

Dear All,
my first time to Tokyo.
should i get Pasmo or Suica card as i will be in Tokyo for 10 days 9 nights? and how do the card work?
thank you very much

Yes, you should get an IC card for convenience. Here's how they work: http://www.japan-guide.com/e/e2359_003.html

Thank you very much.
Can i know if i must get both pasmo card for subway and suica for jr? Or i just get pasmo will do? Thanks again

Just one will do. They are essentially interchangeable when used around Tokyo.

Thank you very much

Read first.
http://www.japan-guide.com/forum/quereadisplay.html?0+150773
http://www.japan-guide.com/forum/quereadisplay.html?0+150213

But IC card(s) is NOT discount/unlimted ride pass.
Just no need bringing big money(note) and many coins and calc/paying each trains/buses with transfering.
Also possible to paying most convenience stores and some famous resraurants and more as "e-money".
http://www.jreast.co.jp/e/pass/suica.html
http://www.pasmo.co.jp/en/

No best 10d covered pass but some pass may useful depends on your plan.
http://www.japan-guide.com/e/e2017.html