It doesn't matter which method you choose for active 3D displays.
Theoretically, TaB is a better choice than SBS for 1080p and 720p content that is viewed on a passive 3DTV. With TaB, only the vertical resolution would get downscaled, whereas a SBS image would have both its horizontal and vertical resolution halved by the passive tech. I honestly haven't noticed much of a resolution difference between the higher quality SBS and TaB videos on my passive Vizio TV.
3D quality, depth, and pop are highly dependent on the content itself though. It all depends on the director or effects specialists and how far apart they separated the images to make depth to recede into and pop-out extend out of the screen.