Now this is a weird argument...
"First, Cortana is unlikely to be “better” than Siri overall, for no other reason other than Siri has been around for years while Cortana is very new."
Back then they've probably written "First, Google is unlikely to be 'better' than Altavista overall, for no other reason other than Altavista has been around for years while Google is very new."
Edit: their point on privacy is excellent, though. Not only concerning location, but also concerning my personal network. Like any assistant, Siri et al need to know who my wife is so that I can tell them "Tell my wife I'll be half an hour late". We have to face that soon Siri etc (and that means the servers behind them) will know all about us, to serve us best, and to serve ads to us best :-)