MPG, FLV or WMV for hosted gals? And why?

[cashgordon]

I am really confused on which format to follow for future projects, so I will be glad if you give me an idea which of these formats do you prefer for Hosted Galleries;

1- FLV Hosted Gallery Sample (http://www.sextronix.com/gal/100005/5/1177583162/)

2- MPG Hosted Gallery Sample (http://www.sextronix.com/gal/100005/5/1177072522/)

3- WMV Hosted Gallery Sample (http://www.hentaibiz.com/gal/201002/5/1170409471/)

thanks