Asked which mini-split brand is best, most technicians who have installed all three will give the same unhelpful answer: any of them, installed properly, and it depends on the building. That answer is unhelpful because it is true. Mitsubishi Electric, Daikin and Fujitsu have been building inverter-driven ductless equipment for decades, their compressors and control boards come from the same tier of Japanese engineering, and a well-sized, well-commissioned system from any of the three will run fifteen to twenty years in a New York apartment.
The useful version of the answer is narrower. The brands differ in specific product lines, not across the board. They differ in how their cold-climate models behave below 5°F, in how far a given outdoor unit can throttle down, in what indoor formats they offer for a pre-war apartment with no place to put a wall unit, and in how their warranty terms and parts pipelines work in this city. Those differences decide the job — and they are the differences the brochures are least interested in explaining.
One more thing the brochures leave out. In a NYC apartment the brand is usually the third decision, after the building and the load. Where the outdoor unit can legally and physically go, how long the refrigerant lines have to run, what the co-op board will approve, and how many BTUs the rooms actually need — these narrow the field before a catalog is opened. A brand chosen first and forced onto the building afterwards is how a good system ends up performing like a bad one.
This article goes through what separates the three, what LG, Samsung and the value brands offer instead, what a system costs installed here, and how to run the decision in the right order. If you are still deciding whether a mini-split is the right move at all, start with mini-split versus window AC for a NYC apartment; our ductless installation page covers what the work itself involves.