Thing is that you probably won't see OKish capacitors in good designs and more often than not in crappy designs that absolutely need high quality capacitors. But because its cheap crap, you see only cheaper caps here...
And so they fail more often because the capacitors are the wrong ones for the design (and maybe the datasheet isn't entirely correct. As the KF series seem to have rather highish ESR if I remember correctly, around 30% higher than Teapo SC).
So I'd rate the KF a bit under the Teapo SC series due to higher ESR...
And the GL Series higher than KF...
But the price at the Shenzhen Market is the only thing that could give us information about the quality of the capacitors, as i'd expect the KF to be a bit cheaper than Teapo SC...
Another thing you miss:
You rate by Company. And that in general is bullshit. As everyone has different quality grades.
The thing with the "Japanese Companys" is that they do not have such "low end" Series as Teapo SC or something like that. And even if they fail (like in iMAC G5 PSU), they don't get flamed the same as others for whatever reason...
As for the ltec caps:
You're talking about the LYZ series most of the time, right?
Maybe an LZP here and there
But not LZG or LZD series???
http://www.ltec.com.tw/product_e.html
The Series Chart of Manufacturers is also important to check as it tells you where the manufacturer sees the capacitor, if it is a better one or not.
You've probably not seen a Capxon GH or FH capacitor, have you?