Personally, I'd go for the Cecil Walker. But then, I'm a Old Phart (I'll be eligible for the 50+ forum in about 7 weeks), a bit of a Luddite and always
partial to lugged steel.
WARNING: The following discussion would touch off the Mother of All Flame Wars in some of the other BF forums - a war would likely break out in the Road forum.
Why do I prefer steel? Because it provides a lively resilient ride. Because you know a steel frame of that quality will last the rest of your life with minimal necessary care. Because if you damage a tube or two of a good lugged steel frame, you can get it repaired for less than the cost of replacement (unless you get lucky and find another used frame of the Walker's quality in your size). Because they just plain look great, and always will.
If I could not get a suitable lugged steel frame, I'd go with TIG-welded steel (most of the above attributes, but much harder, if not impossible, to repair) or titanium (more expensive).
I would not want an aluminum frame because they tend to be less forgiving on the road, as in sending more road vibration up your butt and hands. They also are one-crash frames - if you bend an aluminum tube or dimple it sufficiently, the bike is toast because aluminum frames cannot be rebent or repaired. As for carbon fiber (and here is where my Luddite tendencies really show), that is another name for "plastic," and I simply cannot believe that plastic will not be degraded by UV radiation over time. CF is also another "one crash" frame material - there are very few operations I would trust to repair a CF frame. Calfee here in the states is about the only one I can think of right now.
Also, if you get a crack in a steel frame that goes undiscovered for a while, it will slowly grow until you notice performance degradation, almost certainly well before any catastrophic failure. Which means you get off and look at the frame, say "oh, sh*t" and figure out whether to repair or replace the frame. With aluminum or CF, if you don't catch the crack right away, you are at immediate risk of the frame failing in mid-ride, completely and catastropically. Which means you say "oh, sh*t" while still on the bike, perhaps while moving at significant speed, you feel and hear the frame break, bend, or otherwise become unrideable right now
, and you discover the downside of gravity. At that point, you find a ride home and clean of the road rash if you're lucky, you go to the hospital ER to have broken bones set if you're unlucky, or you're admitted to the hospital for broken bones, head trauma, and/or internal injuries if you are really unlucky. And if you are really really
unlucky . . . well, you get the point.
Okay, that's probably a bit melodramatic, but not by much. Steel rides better than aluminum for the most part. Carbon fiber can be made to ride wonderfully, but I just can't bring myself to trust a plastic frame. Titanium is good stuff, but kinda pricey. Odds that a steel frame will be the heaviest of the bunch, assuming similar price points, but the weight difference is more than offset by its advantages, IMHO.
Now aren't you sorry you asked?