Smart Playlist or Custom Node?

I read up on the Wiki how to create custom main menu entries and so I quickly set up a few xml files to seperate my library.

I use ACE as skin and this lets me set up to 5 Smart Playlists and 5 Video Nodes. Now I'm wondering what is the difference? Are there any pro's / con's when using one or the other? I couldn't find this information on the Wiki