Who Should Kill Maul?

After watching the Rebels episode Holocrons of Fate, I greatly wondered about who will cause Maul's demise.  I only see two people who should end him: Obi-Wan and Darth Vader.

Obi-Wan Kenobi

In the episode, when Maul and Ezra look into the holocrons, Ezra sees twin suns.  An obvious reference to Tatooine, and Kenobi is there, living in exile.

In The Clone Wars, when Kenobi offers to go to Felucia to stop him, Yoda agrees, saying "Finish what he started long ago, he must."

In Legends, Kenobi fought Maul for a final time on Tatooine.  This may happen in the new canon.

Now for who I want to kill Maul...

Darth Vader

In Legends, Vader fought and killed a clone of Maul.

Fans have been arguing about who would win since The Phantom Menace.

Everyone is dying to see this fight.

Sidious has always tested the power of Vader after his defeat on Mustafar.  Maul may be another test, like the clone was in Legends.