Benefits between using Nakamori as Library Video Source and standalone Addon

Benefits

Addon:

pros:

• Shoko Experience™ (For all those extensively using advanced features of Shoko)
• filters support
• groups support
• always update info
• multi-file support
• unrecognized files support
• very customizable (color titles base of airing status, preferred type and language for titles, swap seiyuu images with character images, )
• dynamic picture for every series
• control over spoilers (tags, thumbnails, plot, rating)
• tag filtering (hide unneeded tags)
• trakt support out-of-box

cons:

• some 3rd party skin have limited support (those that are focused around Video Library)
• build-in cast support is limited (you cannot search by appearance)
• it's a bit slower than native Kodi Library (It can be minimized with cache function)

VideoSource:

pros:

• Kodi Experience™ (all Kodi function and most 3rd party addons will work out-of-box with your Library)
• build-in cast full support (searching by appearance)
• super fast (all data is stored in Kodi database after scanning library)

cons:

• very long initial setup (scanning big collections)
• series info wont update after being added to library (have to re-add series)
• no multi-file support (you add first files that is linked to episode)
• no unrecognized files support
• no filter support
• no group support
• static picture for series (re-add series or manually add new picture)
• need to scan Library each time you add new series
• until v19 you need to clean library manually when removing plugin source (https://github.com/xbmc/xbmc/pull/15981)