Which is better passive or active 3D?

Being better depends totally on the experience you wish to have. Active 3D can provide a clearer image if you stay exactly in one spot in a fixed area and maintain your battery charge. Passive 3D provides the same quality image with more options as far as viewing position. Their glasses arent battery-operated neither. If you want a recommendation, there is a type of passive 3D TV which uses cinema 3D tv technology (same technology as the cinema) and it delivers 10/10 for me. I'm not familiar with all the features so you'll have to google it.