I currently use Joplin but I find it’s a bit too over-engineered with many features I don’t use. For me the best note taking app would:

• Be FOSS
• Sync over NextCloud / webDAV
• Support kind of formatting (markdown for example)
• Have ability to create check box lists
• Be lightweight and fast to open
• Have ability to set remainders and alarms (if possible)
• [if possible] as either a windows desktop client or a web client or interface to access notes from work

Now depending on how I like the software, I may change a bit my habits and drop some of those requirements if the soft please me and I find workaround or drop the feature (for example an automated backup can replace NextCloud stuff and I don’t use that much the work computer to access notes, so if it’s good and I can share the note manually by mail or so, I can live with it).

So feel free to share what you use.