Hi Barry. This is the first response that I have been able to write for several months so I hope it is OK. Some here will know I have been seriously ill - lucky to be able to do this at all - and have been in hospital for most of this time. No audio at all of course during that time and still not really back to listening to the system as I have been home for only four weeks.
Qobuz is huge and has many features that cannot be accessed via Mosaic. Mosaic is fine for day to day replay of your albums/tracks but you need to download the Qobuz desktop player to your computer to control Qobuz itself including the quality of sound sent to you, what genres of music you are interested in, the fabulous text information for rack/label/music genre etc, the on-line shop for purchases and so on. Think of Qobuz as having several flavours. Use Mosaic to play via dCS but Qobuz desktop to sort out a base line of what you want (incidentally the best place to pick weekly new releases) and one of the Qobuz portable players if you want to listen e.g. via phone. For example I use desktop every Friday morning to select from that day’s new classical releases. Once picked as favourites they automatically appear in Mosaic which is where I play them from.
Take a bit of time to find out what you can do and which solution best fits the purpose you require and be happy to switch between them as your needs demand.