Some clearnet sites are also available as hidden services such as DuckDuckGo, Ahmia, and Z-Library. Would using their Tor hidden service instead of their clearnet website increase your privacy/anonymity. From what I heard, the user's connection would be always through the Tor network and it would be more private. However, I'm not so educated on this particular subject and I was hoping someone could give a better explanation as to whether or not there are benefits from using a hidden service mirror of the clearnet generally. I know it might depend on the circumstances and there may be exceptions so if anyone has more knowledge on this topic and could share, I greatly appreciate it!
If the site is using plain HTTP (not HTTPS), accessing the site through the hidden service increases privacy. An exit node can see all cleartext traffic that goes through it, as can anyone between the exit node and the site you're visiting. By using the hidden-service version of the site, the traffic remains encrypted the whole way.