Hi, hong kong express card and ordinary octopus card info is quite confusing.

Yes, the best cards are the Hu Tong Xing, a special kind of OC. They can be used on public transportation in both HK and Shenzhen.

You can buy the cards at MTR or Light Rail Customer Service Centers in HK, Shenzhen Tong Customer Service Centers, Metro stations of Futian, Luohu, North Railway Station, and Shekou. :)

what is it called as I was planning to get it at the airport and is airport express included in it?

It is called "Hu Tong Xing". Yes, you can add value to it, and use it to ride on Airport Express Train. :)

thanks. t there other way than airport express we can go to tsim tsa tsui around Nathan road?

Yes, you can take bus line A21 from HKIA to the road. The fare is HKD 33. There are many stops along the road, including Argyle Centre, Nathan Road; Bank Centre, Nathan Road; Sino Centre, Nathan Road; Man Ming Lane, Nathan Road; Nathan Hotel, Nathan Road; Prudential Centre, Nathan Road; Kimberley Road, Nathan Road; Cameron Road, Nathan Road; and Middle Road, Nathan Road.