I prefer MPEG, MPEG2 or AVI with open codecs as XVID. The advantage of this formats is that are universal formats than run on any computer (PC, MAC, WINDOWS, LINUX, ...) or DVD player.
The quality is you that chose, better quality bigger the size.
With WMV you depend on Microsoft and you must use Windows and Media Player, you are in their hands.

Stupidity also evolves!