The video quality of 1080 pixel video is always better than 720 pixel video. The 1080p video is know n as Full HD and 720p video is said to be HD. The main difference between 1080p and 720p is the number of pixels they have.
Do you know the meaning of 1080 and 720 in 1080p and 720p ?
The 1080 and 720 in 1080p and 720p stand for vertical screen resolution, or height, in pixels. The clarity will increase with the increase of pixels.
The pixels of 1080p are usually 1920 * 1080, while the pixels of 720p are usually 1280 * 720.