I've been trying to work out which of these formats looks and performs the best. I know the "P" version is nominally accepted by the industry as being the best, but is not used due to the expense of the equipment involved. So, I have two HD TV's both will display both "I" and "P" formats. My Mac's also provide both options. I have tried both of them, and unless I'm missing something they look identical. Is there really a difference...? ( I shoot Video in HDMI 1080i ) Are there situations where the option of "P" is better?