Well, what programs do you plan to edit video on? Avid Media Composer? Final Cut Pro? Adobe Premiere? Also, how demanding is the video editing you will be doing? Do you plan to do it professionally? Are you a film student? or it just for personal use/for fun?
Since Apple controls both the hardware and operating system and limits the number of configurations, Macs are generally more stable and predictable. And the operating system is more efficient, so you often get more streamlined power from similar hardware. And for this privilege, you'll pay up to 50% more than you would for a comparably equipped PC.
Does that mean you get more bang for the buck for PC? Not necessarily.
There is no one-size-fits-all answer for a comparison of Mac to PCs.
Personally I prefer Mac and that is what I use to edit on.