I downloaded all 5 programs. Because I was most interested in the ability to download the information from the internet for most of my collection, I compared their ability to download from the internet. I wanted the software that offered the most websites that you can download data from.
* Music Library from WenSoftware.com: CDDB only. You can access album information from other sites, but you cannot download it.
* Music Catalog Master from KIX Software Solutions: Musicbrainz, Amazon, Freedb
* Music Label 2010 16.0.1 www.wensoftware.com: CDDB only
* Catraxx: Discogs (a very good data site specifically geared towards vinyl) Amazon Canada, Us, Germany, UK, France. CDDB only if you insert CD into drive.
* Wax 1.0: OpenVinyl, a new vinyl site with very little data. I could not get software to work.
My favorite was Catraxx. I entered numerous albums including pretty obscure stuff and I was able to download data for every one, though for a few I had to download data for the CD from Amazon. It is odd you can only download from CDDB with a CD, but I never had to worry about that. Note, I do not have much Classical, so I don't know how extensive the classical data is. Also, the program has extensive data fields. You can also import databases from almost every music DB software. HTH