22May/11Off
How 3D content works: Blu-ray vs. broadcast
Conclusion
3D on Blu-ray is the only way to get full-resolution images for each eye. Cable and satellite 3D content is handicapped by their limited bandwidth, and will therefore have softer images, likely with artifacts like jaggies (depending on many factors, not least the TV).
It is true that we are still in the early days of the 3D TV evolution, but the cable/satellite hurdles are exceedingly expensive to remedy, and are unlikely to happen with such a small installed base of 3D TVs.
Read this lengthy and thorough consumer-targeted article here.