OpenDesktop versus NextCloud

Hi,
For the moment, I’m using NextCloud on at my hosted webspace. It generally works, there are a few perks (the 500 MB limit for instance), the fact I don’t know how to use the command-line (for solutions sometimes offered on the NextCloud Forum).
I looked at opendesktop.org and it looks interesting, but they also use NextCloud.
Is it more stable or faster? I do find NextCloud works quite slow in a browser. But for saving in the cloud, using CalDAV and CardDAV, it works just fine.
Any thoughts on this? Recommendations? Experiences?