I think it depends on end use.
I prefer Kingpins when it comes to general touring — they're a bit lighter (though I don't care much about that), and I greatly prefer their risers and the fact that they have a high riser. Yes, mellow skintracks are more efficient, but for most of the zones I tour in, I'm not the one setting a skintrack, and I'm lazy enough that I'm usually not inclined to set a new track when there's already one there (even if it's fairly steep).
I prefer the Shifts for the down. Once I got them set up properly, I've never had pre-release issues and the binding feels exactly like an alpine binding, at least to me. The Kingpin feels very similar in soft, forgiving snow, but the Shift feels a bit less harsh on rough snow. And I like the idea that the Shift's toe piece is tested to and passed the same standards as an alpine binding, whereas the Kingpin's tech toe freaks me out a bit for everyday, inbounds riding. I also think the Shift is more durable, but I wouldn't make a definitive claim about it cause it hasn't been around long. And durability is one of the main reasons I'd opt for a Kingpin over a Tecton for inbounds use. I've broken a few Tectons (the heel piece seems particularly fragile), while I've never broken a Kingpin (though the old ones had the well-documented toe-pin issue that has apparently been resolved. Who knows.)
So, at least for me, here's how I tend to think about bindings. Others will definitely have different opinions.
100% inbounds: any alpine binding
Significantly more (~70%+) inbounds than touring: Shift
pretty even split between inbounds and touring, or a bit less inbounds than touring: Kingpin
less inbounds (~30%) and more touring: Tecton
100% touring: any tech binding since I'm usually skiing good snow or not skiing very hard.
**This post was edited on Jul 30th 2019 at 1:03:58pm