I suppose it depends on the specifics of the question. I think #compose-desktop would be the right long-term place, especially if you are talking about anything desktop-specific. I'd see this channel as more of "how do I interoperate with iOS APIs/widgets". But it depends on the question, if it's more of a discussion about a particular function of native builds that reproduces on iOS also, then this channel might be a good place with more people who are familiar with the native/iOS toolchains. That said, many of the same people will likely hang out in both channels, so might not super matter where you ask, just use your best judgement.