And who would have a place in Star Wars lore when they returned? Maul or Windu.
Maul is dead. Windu is dead too.
But if you were going to have one of them survive which seems more reasonable? The guy who was blasted out a window or the guy who was chopped in half?
Windu > Maul
Maul > Windu.
If Windu survived the entire original trilogy would have to be rebooted, as its story would be rendered obsolete. Maul however, has a place in the Clone Wars - as made clear in the series. The last episode with Maul in by the way - was awesome.