I create a Wi-Fi hotspot with My Wi-Fi Router, what sharing mode should I use?

I create a hotspot on windows 7 laptop, my other devices are one iphone, one android phone and a windows Xp laptop upstairs, what sharing mode should I use?

It seem My Wi-Fi Router can have Ad- hoc or Ap WP 2, if so, you can select AP WP2. Because it support for the connection with iPhone or Android at the same time. Hope this would help you.

I think WPA2 is best for you for browsing and security then any other.