Googling it and according to one answer the only difference between uBlock Origin and AdGuard browser extensions is that uBlock has a feature where they can hide stuff instead of completely blocking it.
The entire desktop app, yes. That does DNS blocking. Not the browser extensions, no blocked features there.
I know their Safari extension has some blocked functionality without paying, but fair enough, it may be different for other platforms, I’ll edit my reply then. Thanks for the correction. I stand by the other point though, I think uBlock Origin has an inherent advantage and added trust by being non-profit and fully community driven vs. AdGuard being ran by a for-profit company.