Just saw this post and would like to add my comment, even though it might be a bit late.
I have used two Mankati for about two years now. They both are printing more or less continuously.
I have not used nor owned a Zortrax printer. My biggest issue with the Zortrax is the fact that it is supposedly a closed system, meaning you are required to used propriety materials which seriously limits you in your choice of material.
The Mankati does need some TLC from time to time. Most issues I have had a probably directly attributable to the fact that I am constantly switching materials between like PLA, PETG, XT, ABS, NGEN, HT, Bronzefill, Carbon-materials, Flexible materials and whatever I want to try next. This sometimes leads to issues because of residue filament left in the bowden tubes and/or nozzles and can be difficult to remove. The Mankati can also use some upgrades like a better cooling flow.
I have seen the quality of Zortrax prints several times but the Mankati can reach the same quality with ease.
The main issue is EXPERIMENT. Since the Mankati allows you to choose any material, you have to take your time to find the right filament and settings for your printer. There can be a huge difference in quality between prints using two different brands of filament…
It takes quite a bit of learning to use the printers well, but after that I am happy with the Mankati and love the big build space.