ZT is great for Quality at the price level. they irk me with design tho, in the fact they dont use ceramic detents, they dont always use hardened steel washer races. and there lockbars go all the way to the frame on some models... and then we have the Cedric Ada tests that show less edge retention on s35vn than other s35vn knives (think they tested 2 or 3 different models). tho there elmax tested perfectly fine and where it should. i havent seen any tests for there m390/204p/20cv, s90v, etc.
with all that said i love the ZT's i own (and i have many). plenty to nit pick for some, but they are great knives and well worth getting.
now whats better? thats difficult to say because not everyone does what ZT does. full warranty, blade replacements for nominal fee, free sharpening. mostly ball bearing flippers with a unique ZT design from few different knife makers (and growing).