Realistically, what modern device won't play OPUS files? According to xiph.Org[0] it's transparent at 120
Especially in podcasts where it's just voice the savings in storage and traffic are significant. My own listening preference is 32kbits opus at ~1/4th size of the original 128kbits mp3.
32 is more than enough for books/podcasts, 96 is more than enough for music. I doubt above-96 makes much sense for OPUS - I'd use FLAC if I needed better quality.