VideoSurf www.videosurf.com
Videosurf is providing better search experience to the users because of their features. Users can select different database (YouTube, dailymotions and Vimeo etc.) of their own choice or select all of them to search videos. Videosurf also provide access to different scenes by showing frames of a clip horizontally below. User can also select category to go for more specific. These features makes it user friendly and easy to navigate, so makes it best.
Which one is the best it depends on user priorities.
Here is the list of best video search engines.
Tip: Submitting your videos to Search Engines can bring more visits to your video site.