Picture quality difference of Videocon d2h vs Tata sky?

I want to know about the picture quality of d2h against tatasky, which going better from others at the moment, video and sound quality of sd channels and hd channels, both providing mpeg4 picture, the main difference they are saying is d2h(1080p) vs ts(1080i), is it really matters? Or go with any one? Is Factors like pixels fading, sharpness in hd and upscaled and blurry image in sd counts? Please clarify...


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