I'm lucky to have four different computers at my immediate disposal so I tried the live CDs of the three distros on three of them to see how plug and play they were for wireless networking
Start it here
So as the scorecard stands with regard to plug and play wireless connectivity, Ubuntu scored one hit (the Dell laptop) and two misses; MEPIS scored a half hit (I had to do some menu based manual configuring) and two misses; and PCLOS scored two out of the box hits and a near miss (it did recognize the card). To put it bluntly, on the three computers I tried, PCLOS absolutely mopped the floor with the other two distros. Incidentally – and this is purely a newly formed subjective opinion – the PCLOS GUI also kills the other two.