Bae > bay
Nice try Dontnod I didn't fall for your guilt trip in Max's nightmare. 
spoiler (click to show/hide)
Both endings are kinda shit. The tornado being Max's fault is illogical and making her a scapegoat is mean spirited. This video does an excellent job critiquing the endings
I didn't watch the other ending yet, but does saving Arcadia Bay mean none of the weird environmental things happen? That's a huge plot hole if true. Max went to alternate dimensions and the environmental things were still occurring, why would going back in the past (start of the week) revert shit if going to entirely new realities doesn't revert those things?
I killed Chloe.
I disagree with you, throughout the entire game she's used user powers a ton for her own benefit, hell she used them several times to save Chloe's life.
Using her powers to do something she doesn't want to do was far more emotionally resonant and had a bigger punch for me.
I'd agree in the sense that helping others makes her feel better.
But she never outright uses her powers for self serving reasons, up until the ending she saves Chloe... to save Chloe. She didn't understand she was fucking with time (in a physics sense) and everything else to a certain point, so saving Chloe in situations of peril seemed like the most natural thing to do.
She rarely "plays" around with her power for selfish reasons. The ending to me where she decides to be selfish and be with Chloe, here and now, above all else, makes that relationship seem incredibly special. That's fucked up, but I feel Max has earned that.
Max has seen what existence can look like, from all types of angles. If being happy now, in what time she exists, is possible, its worth it.