Oldish question now but Apple now have a good overview of the main differences here: https://support.apple.com/en-gb/HT204962
To summarise: Apple Music and iTunes Match both give you an "iCloud Music Library" which can be populated in one of three ways: with music matched from your original local music collection, with music uploaded from your collection if iTunes cannot find a match and if you have Apple Music, with music from the a Apple Music library.
So in short, Apple Music alone contains all the functionality of iTunes Match with the only difference being the way that DRM is applied.
With iTunes Match, all music added to your library either via matching or upload is DRM free. Uploaded files can be downloaded on other devices in their original format and matched songs in DRM free 256kbps AAC.
With Apple Music, any uploaded files remain in their original DRM free form but any matched songs, or music added from the Apple Music library, can only be downloaded on other devices with DRM and will only work while you have a subscription.
Finally, iTunes Match can still complement your Apple Music subscription because if you have both you will get your matched music DRM free though it should go without saying that Apple Music content will still have DRM even with a Match subscription.
Hopefully that's clear!