I do believe they save a little as far as not importing the materials to the USA.
As for the ZT and Sage 2, they're completely different knives, the fit and finish is better on the Sage 2, and they used more titanium rather than a liner and g-10 on one side.
On the other hand, the Chokwe is a Ti Frame Lock over the Para 2.
He asked about the quality, not USA vs. Taiwan made.
I think people truly limit their selves sometimes by sticking to USA only. I understand not wanting our jobs to go overseas, however, I think this is the least of our worries.
All in all, knives may have the same materials, the same prices, but one of them has better fit and finish and I bet it's the Spyderco.
By just assuming the USA does everything the best and that USA is the way to go, you kind of close yourself in a box.
Spyderco's Taichung Taiwan knives have excellent fit and finish, and are all around some of the best you can get. Like I said they are on par with knives double the price. And a lot of other knives are on par with the price range they're already priced at.
As for trying the Chokwe and Sage knives, you definitely should. The Chokwe is awesome for a bigger EDC. It's excellent. And the Sage knives make amazing EDC's too.