Simply Vader, because Maul lost to Obi-Wan, when MAUL had the high ground! Maul shouldn't have waited and he should've Force pushed Obi to meet his demise. At least Vader had a fair duel with his son that he lost to.
Darth Maul, not only is he a rather interesting character, he isn't just some sort of angsty teenage child with no control of emotions who could have potential. I also find his fighting style and look quite intriguing and cool...
Simply Vader, because Maul lost to Obi-Wan, when MAUL had the high ground!
Maul shouldn't have waited and he should've Force pushed Obi to meet his demise.
At least Vader had a fair duel with his son that he lost to.
Darth Maul is just a stereotypical no backstory villain.
At least Anakin is interesting