I’ve found radicale more stable in my implementation, but both are very good and are pretty similar to use.
If you already have NextCloud/OwnCloud it would be a good to use the Calendar that is already built in, but it doesn’t make sense to install those for a calendar when there are better options available.
0_o7@lemmy.dbzer0.com 2 days ago
Tasks.org also works great with CalDAV. On f-droid as well.