canon 5d vs canon 550d

I am not very technically minded so I would appreciate if someone could help me out understanding the differences between the 2 cameras and what real practical differences there would be between the two.

When I buy my camera I will be using it for short/feature length films, music videos and commercials.

As the 550d is cheaper I was thinking fo going for this, unless someone could highlight what disadvantage it may have when compared to the canon 5d.


(Oh and I don't really know what I'm talking baout here, but is the rolling shutter a problem, especiually if I move the camera under fast movement/whippans/steadicam shots, running handheld, etc?)
 
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