I have four SAs- .22 Single Six 6 1/2", 50th .357 Flattop Blackhawk 4 5/8", 5 1/2" Flattop .44 Special Blackhawk and a 5 1/2" .44 SPL Bisley Blackhawk.
And one lonely little S&W 638 Airweight .38 on the DA side.
So I guess it's single-actions by default.
Of the five, my favorite would be the standard-grip 5 1/2" .44 SPL flattop, followed closely by the .357. Although neither one is quite as packable as the Airweight, alas.
4" barrel is about as short as I like, and 6" barrel is about as long as I like
In DA I like shooting 6" S&W 29 and 686 carrying a 4" S&W 66
In a SA I like 5 1/2" best I think.
My DA might as well be SA's. I NEVER shoot DA. I would need barn door targets shooting DA.