Depends on why I want it. Rarely shot collectors piece? Hard to beat an excellent condition 27. I would prefer either the 3.5 or the 5 inch barrels as I think they look the best, proportionally, on an N frame. For carrying and/or shooting a lot, I'd go with a 4" 28 for carry or a 6" for a range gun. Now, I don't have a 27 right now and I've never had a 20, but I do have this 4" 28 with moose grips by bigmtnman and a carved half flap holster by bamabiker. Since it's the only one of the three I have, I guess that means my choice was the 4" 28.