choose ODF vs OOXML

I just found out about the "war" between ODF and OOXML and I was wondering which was "winning" and whether I should support one over the other in an project that I am about to start up soon. I have a bias toward The Document Foundation as I used to contribute to LibreOffice, but that does not mean that choosing them is the best business decision. Does it matter? Should I support one? both?choose ODF vs OOXML