But we looked deeply at this at a CCTV company I did work for. The answer is that you can find both. But as time marches on you may see SD (480p) vanish in just a few years.
Even though the output on basic camcorders may be 480i, are the image sensors resampled between fields? If not, wouldn't the image really be 480p since there are no temporal differences between fields?
This dumb question is at the core of a heated argument.