Kaizer for the cheaper but acceptable, sometimes a few slip through QC process, but over all a very decent tool.
for high quality, addition milling and features then we go into WE knives, Reate, and Rike. these are comparable or surpass the ZT line of knives in quality. each one of these manufactures makes other brand knives, for example todd begg and Lion mauh both are made by Reate. We knives makes some of the Quartermaster knives.
These cost more than the Kizers but they are worth the cost for what you are getting from the additional 3D milling, anodization blade designs, and ceramic bearings and detents etc. while Kizer is a great brand, you still get some with so so quality and you see it in the reviews, not to mention they are not on the same level as the other three manufactures. The kizer knives will be cheaper because of all of this. again they are not a bad tool.
ZT's are some of my fav's but of all the ZT's i have, the reate, rike and we are better.
also want to add CKF, custom knife factory. they use materials from the USA and manufacturing in china with Russian design. these are up there with the high end Chinese manufacturers, tho i dont recall which manufacturer makes them for them.
steadmond is decent but some of there knives are iffy, overall a decent brand, but id rather get one of the others noted above (including zt, but not over kizer)
if you are just looking at price, go with kizer.