I have the 1940 version on the tivo, but I haven't had a chance to watch it yet.
I saw the '44 version a few years ago and liked it, but wasn't crazy for it. Robin Wood really liked it, he called it the ultimate Ingrid Bergman film in his Hitchcock book, her star persona being built around the conflict between the audience's admiration for her healthiness (youth and beauty and earthiness) and our joy/horror in seeing her punished by having those same qualities taken away or corrupted. Gaslight is the ultimate example of this, but also Notorious and Under Capricorn. Thus also the big backlash against her for the Rossellini affair.