I am a complete noob, so check anything i say.
It is pretty flexible and fun.
I have put volumio on a pi zero (w) in the garage with a cheap aliexpress dac hat.
I run it headless and use my phone to control it.
Well, I don’t actually bother, I have it set up so it plays auto when switched on.
I currently have it playing Radio Paradise, but could also use it to play stuff from micro sd card or a connected usb stick or hard drive.
I am thinking of setting up a nas and running it off that.
Indoors, I am using a rpi3b+ and aiming (gradually) at somewhat higher end/great value end.
I rather like with it that you can plug hdmi in and use monitor, run it from phone or go for a display.
What confused me the most to start with is the amount of options.
You can use it for pretty much what you want and pick what quality you are after.
Pick a budget.
I haven’t found anything that volumio can’t do that i would like it to do yet.
Apparently, the usbridge sig is a less noisy basis than the pi though.
But that is a chunk of budget higher.