About the File Formats
There is no difference in audio quality but FLAC & m4a are a compressed file format while retaining the full lossless audio quality. Each package also contains mp3 versions for convenience.
Apple Lossless m4a files can be played in iTunes and all iOS devices as uncompressed lossless audio. If you only use Apple products, choose this package and add it to your iTunes library completely tagged with cover art just like a regular mp3 but in lossless quality!
FLAC is a compressed file format that retains all the audio data of a WAV file without loss of audio quality. Choose FLAC only if you understand the FLAC format.
WAV is the original uncompressed file format suitable for all devices and can be converted to your format of choice if needed.