It's become an epic debate among filmmakers as to whether one medium is really superior to the other. But while there are several fundamental differences, which I'll explain here, the fundamental factor between the two is cost. Whereas film needs to be developed and have light shone through it in order to be projected, video is captured on magnetic tape and scanned back over a playhead. Whether the tape itself is analog or digital, the process of taping is fundamentally a digital thing, which means it can only reach a certain resolution before it starts to degrade in quality. Film, on the other hand, can become as large as the distance from projector to screen (determined somewhat by the strength of the projector) allows.

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