Using right queue types

Hi this is scheme of queue tree

Internet download(global-in)
-http(parent: Internet download)
-video( parent: Internet download)
------flashvideo(parent:video)
------streamvideo(parent:video)
------youtubevideo(parent:video)

Now I use pfifo queue type for Internet download, also for http and video. For subcategories of video - flashvideo, streamvideo, youtubevideo I use pcq. Could you help if it is good way or is better to use pcq also for http and video?
Or what do you recommend?