I actually think Obsidian is a great tool, but I just need something as low friction as possible to quickly jolt something down. Vim and Goodnotes does the trick for me.
There was an exception though, where text just didn't cut it, which was a brief period where I was importing vehicles from Japan and needed lots of images, documents and comparisons up on a big digital whiteboard. I used LogSeq for that.
The Notes folder(s) is sync with a Cloud Service. So, I use iA Writer[1] (a brilliant Notes App) to have a pleasant writing experience on other mobile devices. They are just Markdown, so I can open them in any Notes App that supports Markdown. I paid for iA Writer once, like 10+ years ago.