Doesn't realy matter which one you choose. They all use roundabout the same kernel. Some are easier to configure then others, but that is about it. The newer the distro the more hardware it supports, generally.
This card uses the Prism2 chipset and is a 802.11b device, correct?
I am not to familar with these things, having never owned one... but it should be supported by the Linux-wlan-ng drivers. They should be provided by your distro in one manner or another.
If you do not know which one to choose.. choose Ubuntu. Be sure to read the documentation aviable on their website.. it's is very valuable, especially the FAQ. Ubuntu is different from Windows and has a very different way of handling drivers and installing software.