I'll bite. What format, sample rate, bit depth etc do you use for your listening? Is it the same regardless of setting/system?
(TL;DR is at the bottom, I thought this would be a quick reply, but I guess I have can't piece together my thoughts this late at night)
As for specific sample-rates/bit-depth and such, I just go with whatever offers 24-bit, and as for the sample rate (if 24-bit is offered at 48kHz, I'll get that, if it's offered at 96kHz, I'll get that).
If it's at home listening, then naturally lossless since that's what I have on hand from primary purchases (FLAC being my favorite, as Wav doesn't make sense due to metadata limitations, and just pointless filesizes), and perhaps DSD produced music (just so you don't have to worry about DoP conversion being inadequate or something).
So I personally listen to FLAC mostly at home (some older obscure music from DJ's I can't find in lossless format, so I settle for whatever).
The type of system isn't pertinent, so much as intent and location. If it's listening with eyes open and not much attention on the music (like walking around on the street, or using portable sources), I feel either Opus (my new de facto favorite lossy format for the incredible space savings on taking huge libraries with you on a USB stick for example), or just MP3 VBR V0 seeing as how many sources aren't capable of properly handling Opus sans-Ogg containers for whatever reason, while MP3 320 just having some data showing 320 kbps is sometimes worse than V0.
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Since I don't really use Spotify or any other streaming service, most of my stuff is purchased or ripped from purchased discs (I like to buy discs if they're offered). At home, regardless of setting, I listen to my music at the highest format offered, regardless of my setting/system. On my iPhone I like to just load up MP3 V0 (since this retarded company will not support Opus natively after all these years). But yeah, otherwise, the best possible if I'm at home (as I don't want to convert to a bunch of different formats, just MP3 V0). But yeah, the only reason for having lossless is simply archival purposes, and whenever I convert, I would be working with the proper source. I don't want to convert lossy to lossy a bunch of times.
Oh I just remembered, I do listen to a streaming service. Amazon's. But that's only because it's included with my Prime, and only when my computer isn't on for JRiver to send music across the network to my TV.
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TL;DR
I like having offline lossless files for archival purposes, and listen to those since hard drives are cheap.
For mobile sources, I go lossy almost exclusively since Apple's piece of shit stubborness will never allow SD Cards, nor Opus, so I resort to MP3 256 VBR. I'm looking at dumping iPhones, but their hardware is my favorite, and their software support and just overall UI/UX is most pleasing since I don't like doing too many crazy things with my phone anyway. Looking to get an LG V50 or something and put an end to this, but I'm on the fence.
I stream from Amazon Music when my computer isn't on (so that's lossy as well).
I'm also hoping JRiver team wakes up and finally start to support Opus (they're being coy and saying "Jriver can play Opus files just fine", when the issue is importing of metadata is non-existent). Likewise with the rest of the industry, and especially mobile devices. The storage and battery savings from having such small files (96kbps is more than enough for me), I imagine would be a boon to this plague of poor battery life from so many devices on the market these days.