Traveller’s Tales’ director Jon Burton told a popular video games website that he thinks Sony's motion capture is better than Microsoft's offering because...On Project Natal:
“exceedingly clever, but the lag on the input and lack of physical buttons is really going to restrict the kind of games that can be done with it,” he added, before going on to praise Sony’s alternative.
On Sony:
“Sony’s solution will be cheap, accurate and will put buttons at your fingertips, meaning everything from action adventures to FPSes can be handled with the same input."