I've used a synology as my first NAS. Using truenas now on a selfmade larger one.

The learning curve for truenas vs synology is immense tbh. I'm still not fluent in truenas usage.

You have to be a hobbyist to use a truenas. Synology is fire and forget tbh. My technologically incompetent Gen z (seriously, wtf is up with Gen z it skills...) kids/nephews could use synology. No way they would get truenas running.

That being said, I personally do prefer truenas, but I've put in days of works to get where it is.