Difference between app on computer vs smart tv or streaming devices


Hope this is posted in the right place.

What differences are there between the music streaming services when accessed via:

pc
smart tv
dedicated music server/streaming hardware

Will I notice a difference between utilizing web version via a laptop connected to my AV preamp vs... just using app via roku or smart tv app?

And how much better is a dedicated music server etc?

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And - how do I make the most out of using each of these?  What cables do I need etc? USB vs cat vs hdmi etc... 

DAC vs no dac?  And what is the cheapest dac I could get - that would significantly improve the sound quality?

....
lightfighter2018
One unexpected difference I have found has been with Netflix.

It seems I can stream 5.1 netflix via my Oppo but not my Roku premiere.
Get the cheapest internet connection possible. I use it mostly for work - email and stuff - but also for the DVR's TV guide. You'll need either a smart tv or a streaming device (ie Firestick or Roku) too.
domyhomeworkonline
I think it depends on the App.  Some work very differently on different OS