@Kanami-chan
Lelouch's ending is just absurd and nonsensical for this series, i don't understand how so many people have come to seriously believe it recently.
Although the genocide ending would be a bit weird too, not that i would dislike it on the contrary i'm rooting for Eren 😈, but does Isayama have the courage to pull such an ending?
The other option people believe is "talk no jutsu" Eren, which personally it would be cringing and could ruin the ending considering how determinate Eren has behaved in this final arc. These people take at face value Eren's apparent "depression" as seen at Marley in last chapter, and believe his will can be bent, but the truth is Isayama is still hiding from us his memory shard with Historia in chapter 120, there could be more to Eren's motivations than what meets the eye.