Video (1641 programs)
Pros: More professional than most YouTube downloaders. Fast downloads on big files.
Cons: Doesn't offer many advanced options. Not free.
Pros: Get a copy of online videos. Convert online videos into offline video formats. Make videos available for viewing in different platforms. Save copies of online videos before they become offline.
Cons: May not able to get videos from every videos. Downloading videos could be illegal in some places. May not convert to other specific video formats. Video quality could decrease.