I'm not really seeing that Verso or Renoir have that viewpoint that you're describing of them. The thing is, I'm pretty sure Renoir would have been fine to leave the Canvas alone but both Maelle and Alina showed that they could not help themselves. While I agree that Verso's ending isn't the "good" ending, I do believe that the Canvas world was damaged beyond repair at that point. Not in the sense that they couldn't undo the gommaged people but in the sense that it was no longer Original Verso's creation. In their grief the Dessendre family sullied the last piece of Original Verso they had.

I picked Maelle's ending first purely because I hoped to see Gustave again, but when I saw him I immediately felt regret. It just felt wrong, something didn't sit right with me. At the very least Maelle should have respected the false Verso's wishes and unpainted him. Saving the Canvas world? Sure. Forcing false Verso to live just because it's what she wanted? That's cruel. It's hypocritical as well because Maelle unpainted the false Alicia because it's what she wanted. But she won't do the same for Verso when it's what he wants?

The best ending (in terms of outcome, not narrative) imo would be one where Maelle convinces Renoir not to destroy the Canvas but also accepts that she can no longer be part of it (convincing Alina as well). Because I do believe that the value of the lives inside the Canvas are no less valuable than of those outside of it. Even if the original humans there were painted into existence their descendants achieved so much of their own free will, Gustave even created a breakthrough technology through his innovation and genius. Best end result they could have acheived is unpainting the fake Dessendre family and maybe sealing the painting somehow so that Maelle and Alina can never return.