For all round sharing it's best to rip as mp3 which is arguably a better format than wma anyway. Many people block/filter out wma results because it is often used as a spam format. Also ... What you should know about WMA/WMV Files.

Not everybody has the ability to play or burn wma files. But most if not all people have the ability to play mp3 format. mp4/m4a format is another newer & becoming much more popular & is an improved format beyond both mp3 & wma.

It's a little bit like those people who rip files as RealPlayer format. Not everybody can play those, and not everybody even wants to play them or search for them. It's a patented format also similar to wma.