Depends on what aspect of the tech you are comparing. The Buckling springs have the uncontested longevity afaik, but the rest of it is generally a matter of preference in terms of what you are using the keyboard for or where (which generally matters in terms of clickiness or quietness unless you just have a personal preference). How you type and what kind of switch best complements that would be the best way to make a comparison. Do you like a key that actuates with more or less pressure or has a longer distance of travel before bottoming out? Those are the things that qualify which technology is better for the user.
My own experimenting has led me to conclude that I like clicky keys and a springy response (BS, blue cherry, white alps and all the imitations of these) but that the heavier force required for the BS actuation means that I tire more easily on those than on the cherry and alps. I found that the blue cherry has the lightest touch of the clickies that I've tried, which makes for marvelous and energetic typing without fatigue even after long stretches. My personal favorite ordering of preference, since I do a lot of writing/word processing type of input is Blue Cherry>White Alps>Capacitive BS> Membrane BS.
But I cannot offer opinions on the tactile only keyswitches (brown cherry/topre) as the only one I've tried is the black ALPS of the Dell AT101W which I liked well enough until I tried the others. The Black Cherry switch is linear, and I don't think that appeals to me in the slightest, as well as having higher force requirement, so I intend to stay far away from those myself.
