> For someone out of the music codec game, is Opus generally the best codec to go with these days?
not for compatibility. mp3 is ubiquitous. my 2017 VW can play mp3 and even flac from an sd card. i doubt it even knows what opus is.
i think you'd be hard pressed to tell a difference between a well-encoded (flac source) 192kbps vbr mp3 and 160 kbps opus. the file size of the latter will be 30% smaller.
> What software do you use to listen to music on your computers?
on windows, foobar2000. it's superb, no bs and has tons of optional plugins.