I have not used nextcloud, but I am using onedrive. They are all free tiers of joplin, and there have been some problems, such as
- Those who are using free nextcloud service providers, be warned!
- Mentally exploding, Joplin's sync is a shortcoming, and for me, it's fatal
But for now, I still recommend onedrive, the reason is very simple, it has been used for a long enough time, although there have been problems, it can already be considered reliable. And onedrive is a product of Microsoft, and it may survive for quite a long time - this is not always the case for each nextcloud. Of course, you can also choose the paid joplin cloud, which may be faster than any plan in the free tier, and supports more advanced features, but it has been out of time too short, and there have been some problems recently, so just For now, I still don't recommend it.