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.
My college, Fitzwilliam, was pretty good but unfashionable and I lived in digs so I was not part of the cloistered 'old college' environment, which frankly was a bit intimidating. But I worked hard and settled in by exploring politics and girls.