Time-lapse photography or sped-up video?
There are two ways of creating a time-lapse. The first is by taking a series of photos at a set interval. The other is by filming a long video clip and speeding it up in post-production.
Speeding up a long video can achieve much the same effect in a pinch. However, a proper time-lapse with a stills camera will produce a much more visually pleasing result.
By slowing down the camera’s shutter beyond what most video cameras allow, a stills camera can capture extra motion blur which makes a time-lapse look far more fluid and, as a result, more visually appealing.