XBee versus WiShield for wirless comms?

Hi,

Any advice re the pro's / con's of using XBee or WiShield for wireless comms? Like what would be the difference from a programmers point of view having to use one or the other? The WiShield seems more expensive, but does it make it easier for the coder perhaps to use?

http://www.littlebirdelectronics.com/products/WiShield-1.0.html

Thanks

I had the scenario of inter-Arduino communications in mind Richard - I wondering whether the extra cost for a WiShield may make it easier to program? i.e. easier for a beginner

ok thanks Michael - I probably got a wrong impression when I read the description - I'll download some more detail