Apple computers were made for high speed computing. Built with video editing and compiling in mind, Mac's have advanced processing and graphic acceleration as standard features. You will have to pay extra for them on a Windows machine and it still won't be as fast. Ad agencies and media companies use Apple by a huge margin over Windows because they run faster and are more intuitive to operate. Very critical for video editors who have to meet tight deadlines.
No, Apple computers are not inherently better than Windows computers for video editing. Instead, Apple computers tend to have better software than Windows computers for this purpose, but this is only because it is expected of Apple. Thus, it is a self fulfilling prophecy, and better software gets made because better software is expected to be made.