Everything I'm trying to do right now is totally in the air... everything I'm looking at gets me about 90% to a solution......
I'm an IOS guy with iPads all over the house displaying control pages. I added Echo's to my ecosystem because my wife was constantly switching off my indigo screen to iHeart Radio or Pandora. Anyway.... I think Amazon is getting close to doing music sync (they just added the "Drop in" thing which means now my echos all are differentiated from each other. Once I can send audio to an echo from another echo, I will have streaming music covered. (Echo dot connected via 3.5mm cable to indigo mac server input.... selectable as a source from Airfoil).... Then, in theory, all echo devices and airplay devices will be able to play the same stuff at the same time (streaming audio). Once that step is covered on the Amazon end.... fingers crossed, airfoil will add support (skill, whatever) to recognize an echo as an airplay device.
For music on my server.... I've got some time.... way too much music in folders right now that my wife and I are still purging through (weeding out all the crap before importing it into a library). For the most part, using music on my server won't be for specific albums... probably more for playlists. Play "Vikki's Plex playlist" or Play "Bill's Plex playlist" or "party playlist", etc.
I don't think I will ever have to worry about Plex trying to "re-organize" my files (like iTunes did)... and it would be nice to have music available on TVs.... but I haven't settled on what will be the main music player for just audio devices (airplay).
Downside to the web client on the server is that I use Safari for other stuff. (I use it to pull specific indigo data control pages to display on other control pages via RemoteSite.).... it's a work around to get dynamic content within control pages.
I've also thought about separating out my server and putting Plex (for example) on a dedicated NAS device.
Also waiting on PLEX to update what devices can view Live TV. I'm using "Channels" app on TVs right now for live, and using PLEX to record TV, but it will be nice when it is all inside PLEX.
To summarize.... I'm all over the place right now.
I did just re-aquire some old android tablets (upgraded my kids from some cheep iRulu tablets to Amazon Fire tablets).... will probably check out demo pad at some point.... but I'm also in the middle of learning Z-wave (just added my first batch of those buggers and I'm not use to the way they respond compared to insteon devices.)