I have more freedom when I write fiction, but my memoirs have had a much stronger impact on my readers. Somehow the 'message,' even if I am not even aware that there is one, is conveyed better in this form.
“A man ninety years old was asked to what he attributed his longevity. I reckon, he said, with a twinkle in his eye, it because most nights I went to bed and slept when I should have sat up and worried.”