I really like Werner Herzog. Too many good ones to list them all here. He brings in a lot of social implications of whatever subject he covers. A lot of randomness as well which is often quite funny. E.g. Encounters at the end of the world or Lo and behold: https://en.wikipedia.org/wiki/Lo_and_Behold,_Reveries_of_the...
Petter Mettler is a great film maker imo, e.g. Picture of Light, due to the poetic and philosophical elements mixed in with actual documentation. Visually very appealing: https://en.wikipedia.org/wiki/Picture_of_Light
Another favorite film maker is Stanislav Mucha who covers a lot of European topics and in particular German. Very ironic and partly sarcastic. Favs are Absolute Warhola, a film about Andy Warhol's extended family in Slovakia:
https://en.wikipedia.org/wiki/Absolut_Warhola