Uh! Good question. I watch too many documentaries and enjoy just about all. Sprry I really didn't take note of the titles, so I'll try by description.
Two that did capture my attention were both by PBS. Remember the one Dezign posted about some mixed (father was an American military dude) Vietnamese woman who was adopted during childhood by an American single woman. She had a bad relationship with her adoptive mum. In my view, she had this urge to fill that void by tracing back her heritage. She flew to Vietnam for that purpose. This woman was such a nuisance with her behaviour. I mean, I don't have a problem with she objecting to her biological mum and family requesting financial help, but the way she handled the whole thing. How embarrassing! As pointed out by others, it didn't help either that she put herself in such position, since people in those poor countries tend to make more demands. They feel even a struggling American has it way easier than a struggling citizen of a third world nation (this is true, especially when currency is factored in and opportunities had in the USA). She was never once at least grateful of her biological mum's role in giving her a better opportunity (i.e., putting her up for adoption). Her adjectives to describe her biological mum was rather odd or rude. I don't care if she isn't close to someone, it doesn't give her the license to disrespect someone. She basically has ties to her biological family all cut off now.
Anyway, then there was the documentary on the guy who helps senior citizens in his country (I think it was Colombia). He started at an extremely early age (about 6). His non-profit organisation was managed by children also volunteering their time. They had no real location for meeting and other purposes, except the home of his poor/struggling parents. France (citizens, that is) helped his organisation after hearing his story on TV. They donated $100,000 the first time, then $60,000 (from my recollection) the second time. He finally built his ideal home for the homeless and wretched senior citizens. It was so inspiring to see a little boy grow to do something good for people. He still works for his organisation, except he's in school as an aspiring lawyer (if I'm not mistaken) to represent the interest of the senior citizens. I think I'll take this as my favourite documentary.
There are too many documentaries I enjoy, both in the form of movies and just regular programs. I won't even try contrasting or comparing them. Most are excellent.