Darth Vader is driven by love - largely for his wife, Padme, who was the reason for his transition in the first place. read more
Aside from the fact that they are both apprentice of Sidious, Darth Vader was a former Jedi Knight that was turned into the dark side while Darth Maul has always been a sith and has been working on the dark side all his life. Another difference between them is power. Darth Vader has the most midichlorian count of all the jedi including sith. read more
Darth Vader and Darth Maul are completely different characters that have no connection. Maul was in the first, but 4th Star Wars movie, The Phantom Menace. A lot of people do like Darth Maul, but he wasn't in the movie all that much. And when he was in a scene he rarely talked. He only had 3 lines in the whole thing. read more