Originally Posted by Jefftra
Depends what he is using it for, if he has gaming system and blu-ray then you want to go with 1080P. If it is just for cable or directv then 720P would be fine because that is the best signal the cable providers use anyhow.
720p is 1280x720 or 921,000 pixels per frame.
1080i is 1920x10780 or 2.1 Million pixels per frame or over twice the detail per frame.
The disadvantage of downscaling 1080i or 1080p content to 720p is that since 1/2 of the pixels are being eliminated a high percentage probably actually contain meaningfull content such as the boundary edge of objects so the resuylting image will not be as sharp.