Lightroom CC misses a ton of features you would expect. It can't print for example. Many of these will get added over time though. But in the mean time for most people expecting these features Classic is the right solution. Only if all you do is share some images on the internet, mostly shoot with mobile devices, and don't need any fancy features, Lightroom CC is fine. CC can do text watermarks but not the watermarks you can do in Classic.
I actually use both and sync between them and the combination works really well if you understand the limitations.