Maelle's ending is the feels ending because we want the canvas people we've spent the entire game with to be happy, but we also get reminded of the consequences of this action, ie she is slowly dying and addicted and becoming the new Paintress just like Renoir warned us about.
Verso's ending is the realistic ending because as much as we want to believe, the canvas is NOT REAL LIFE and shouldn't take precedent over real people's lives being at stake, feelings be damned. But they make sure to give us that final send-off for one last feels trip.
They're both bitter-sweet and great, but I lean towards Verso's being the "right" ending.