Hi.I have owned (and still do) both. Different sound signatures, M2 has a slight edge in battery life. M2 also has dedicated Line Out none on Calyx M. Both have janky UI quirks. M2 can be rooted and customized and use streaming services. Calyx M with dual slots offers larger storage options for onboard playback.
which has more ear time in my world?
Calyx M - to me it is a bit more in line with my sound preference regardless of having less runtime. Although, I have run them back to back on many occasions without any regrets.
Don't expect perfection from either, enjoy what they can do for music playback (assuming you like how they sound)
I agree. I'm enjoying