Earthlings (2005) was life-changing for me, opening my eyes to veganism. A more recent version is Dominion (2018).
But these deal with a gruesome topic. Planet Earth (2006) is more suitable for “favorite”. It blew me away, because I’ve never seen wildlife footage like this before.
Wait. You mean no social media AND no ads?
I would browse the internet as a “child” all day.