1080p is 1920x1080 pixels on any given frame, which equates to 2.0736 MP per frame if you want to use digital camera speak. 1080i is 1920x540 pixels on any given frame, which equates to 1.0368 MP per frame... 720p is 1280x720 pixels on any given frame, which equates to 0.9216 MP per frame...
For video that is the same frame rate, 1080i takes up 12.5% more bandwidth. Now using a good deinterlacer and halving the frame rate, such as 1080i@60fps to 1080p@30fps, you can make a 1080i video into 1080p video. Only then will the resulting video look discernibly better than 720p. Then again 1080p needs 125% more bandwidth than 720p.
In short, the jump from 720p to 1080i is practically marginal depending frame rate. Assuming they are the same, there isn't much of a difference between the two
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1080p is 1920x1080 pixels on any given frame, which equates to 2.0736 MP per frame if you want to use digital camera speak.
1080i is 1920x540 pixels on any given frame, which equates to 1.0368 MP per frame...
720p is 1280x720 pixels on any given frame, which equates to 0.9216 MP per frame...
For video that is the same frame rate, 1080i takes up 12.5% more bandwidth. Now using a good deinterlacer and halving the frame rate, such as 1080i@60fps to 1080p@30fps, you can make a 1080i video into 1080p video. Only then will the resulting video look discernibly better than 720p. Then again 1080p needs 125% more bandwidth than 720p.
In short, the jump from 720p to 1080i is practically marginal depending frame rate. Assuming they are the same, there isn't much of a difference between the two