Neither ending is good, but letting Renoirs genocide everyone in the painting simply isnt an option.
Also, Maelles ending is the lesser evil because shes not stuck in there. It leaves her able to return to the real world later if she wants to, while Versos ending eliminates the painting and everyone within it forever.
Besides, in the Verso ending there isnt some loving family around Alicia, they all go their separate ways after the funeral and shes left to suffer alone.