What version of SongKong should I choose ?

Without buying a license the licensing defaults to SongKong Lite, this gives free Status Report and Manual Editing, plus allows you to preview all the advanced automated matching and duplicate deletion tasks.

Standard, Premium, Melco and Pro all support automated matching but there are some differences in features.

Feature Lite Standard Premium Melco Pro
Status Report
Manual Metadata Edit
Add Albums to MusicBrainz
Fix Songs
Delete Duplicates
Rename Files
Match to One Album
Bandcamp Match
Auto Edit
Scripter
Parse Naim Rips
Fix Charset Encoding
Options optimized for Melco
Commercial Use Allowed
Performance
Add Acoustic Metadata

Performance

Because the lookup rate for the Pro, Melco and Commercial editions is twice that of the standard edition your songs will be matched quicker with Pro.

Acoustic Metadata

Acoustic Metadata summarizes the characteristics of the actual music such as BPM, Mood, and the Musical Key. This Acoustic Metadata is collected by AcousticBrainz. Acoustic analysis is only available in the Pro, Melco and Commercial editions.

Bandcamp Match

Bandcamp Match works like Fix Songs but matches your songs to Bandcamp rather than MusicBrainz or Discogs. Bandcamp is the premier site for self released albums, the majority of bandcamp albums are not in the MusicBrainz or Discogs databases.

Naim Rips

When a Naim Music Server is used to rip a CD to Wav format the metadata is stored within separate files instead of within the Wav file, meaning metadata not visible if using their music on a non Naim system. But the Naim Import Metadata task can embed the metadata currently in your music files so the metadata can be universally enjoyed with players other than Naim, including for example the Melco Digital Music Library