When I digitised my LPs I produced both CDs and mp3s. In those days I played the CDs at home and in the car. Now I mostly play them off a hard disk at home (I haven't unpacked the CDs since moving) an SD card in the car, and via Bluetooth from my phone. The early CDs may have rotted, but it doesn't much matter; I knew they might when I started.

When I started, hard disks were small and expensive . Initially I produced mp3s of mediocre quality (128) though that quickly improved as disks got bigger. And I knew I could rip the early CDs again to higher quality in future years, though I haven't so far - and maybe some won't play.

If I were starting now, I wouldn't produce CDs. I'd produce FLAC files for playing indoors, and for backups, and mp3s for mobile use. I might choose aac files rather than mp3 these days - though mp3s are more widely supported.