My favorites are The Hours and Gattaca. They are solid films that can stand on their own, but I also find their treatment of the motivations behind suicide nuanced and relatable. People to this day search for a single cause for suicide, and it is my view that they search in vain.
For The Hours, suicide is an escape, a liberation from a terrible life with no (obvious) choices left to make it better. The suicide in Gattaca can be seen as similar, but I would argue that it is more strongly tinted by self-loathing rather than a desire to free oneself from misery.
I have personally experienced both forms of suicidal ideation with self-loathing being my oldest motivation. Though I still struggle with bouts of low self-esteem, I have come to realize that my deficiencies are not so dire and had been exaggerated in my mind due to my upbringing in a dysfunctional household. Once I came to terms with this, suicide turned into a potential kindness to myself, not a punishment.
In both movies, the characters who struggle with similar problems but don't commit suicide find a way to live life on their terms despite the odds. They don't allow society or their personal circumstances to constrain them.
Without getting too spoiler-y, I relate strongly to the character in Gattaca who commits suicide at the close of the film. Before, when I first considered suicide, ambition was a way I tried to fill the hole inside where self-respect should have been. If only I could achieve ABC or become XYZ person, I would finally be good enough and deserve to live. What I found is that this was an illusion. No achievement or victory or praise would ever be enough to make me love myself. The character in Gattaca never had this insight. Though I love the story that was told and view that character arc as necessary to be a foil to the protagonist of the movie, I sometimes wonder what a happier ending would have looked like where our suicide victim was able to change.