Your favorite rear end/final drive ratio and why?

93 V/8 Dakota. 3.91 auto overdrive. Nice around the suburbs.
98 360 B3500 van 4.88 auto over drive. That's the hot setup for heavy towing at 55 mph overdrive off.
64 413 New Yorker 2.92. Sweet at 80 all day.
And others.
V8 Dakota 3.91 w/AOD is pretty much the tow package. My 2000 Dakota 3.9 w/AOD and 3.55 gears runs down the Hwy at 100KPH or 62MPH at about 1900 RPM.
Yup heavy tow in the 1 ton with OD off but the revs will be up there.
The New Yorker w/2.92 is good for a lux barge. That 413 just running nice at 80. Throw an OD trans in and probably run about 1600 or a bit more at that speed and get good economy doing it.