Your favorite rear end/final drive ratio and why?

My combos:
1970 dart: 340, 727, 8 3/4 with 4.10 gears, 26" tall tire
1967 Fastback Barracuda: 440, 727, Dana 60 with 3.73 gears, 28" tall tire

Love them both for what they are, and wouldn't change a thing.