My Schwinn Prologue is Tange Prestige. It is super light, strong, predictable in handling and comfortable on long rides . A friend had a cycle-cross frame made with Reynolds 853 tubing at it was a great ride! But my favorite was a friends road bike with Dedacciai tubing and you could squeeze the top tube with your fingers and probably dent it if you squeezed hard enough.
Found this from a road bike forum that seems appropriate:
"The three major suppliers of steel bicycle tubesets--Reynolds, Deda, and Columbus each have some pretty good products to offer. But the "blows them all away in stiffness and comfort and is only ounces heavier" label cannot really be applied to any of them. The various labels refer to particular alloy/treatment packages, and in many cases offer mix-and-match possibilities viz., eg., tubing diameter. 853 is a pretty up-to-date modern, air-hardened tubing, but it doesn't just come in one weight--even for a given sized frame. And it doesn't just build up into a frame that feels one particular way. Because it is stronger than, say, the old Rynolds 531, it can (and is) used to make thinner walled (and consequently lighter) tubes and framesets. In standard configurations, slightly larger diameter tubes will provide a somewhat stiffer frame than familiar from 531 days. But how the thing will ride depends on many choices that are still left up to the builder even after he has settled on 853 (or whatever). (Not to mention things that have nothing to do with the frame.) EOM 16.5 is very strong, and can be built into very light (at least for steel) framesets, but the ride will vary according to design choices available within the 16.5 offerings. The technical differences may be the best you can do in many cases, before you start asking about particular bikes/designs."