So we agree on this one: we both prefer the 1939 version. My wife does as well for the reasons you quote: brevity and less sentimental. She likes, but does not love, the 1957 version.
I didn't mean financial returns. The Beatty remake isn't as good as the 1957 remake, which is not as good as the original 1939 version. Granted, the 1957 version is the most popular because it's been around with multiple exposures while we were growing up (I even saw it theatrically...
Each remake yielded diminishing returns. None, sad to say, is as successful as the original; not even McCarey's own remake (and I desperately love Deborah Kerr).