Parts and service are one thing...history of downtime for each brand is another. There is such fervent loyalty to each brand, it is impossible to know which one is best. There is no consumers digest or any other objective reviews of ex's. I read countless issues about each machine, but nothing conclusive. Then one has to weigh it against the cost of the machine...
A real bugbear of mine is the specs...almost meaningless. If a mini can bucket curl 8k worth of rock all day long, for years without having to change bushings, is it worse than one that can curl 9k, that needs bushings, ram seals, and a pump rebuild in two years? Maybe the owner of the first one is a hill billy (like me), who could care less about a 1000lbs, but doesn't have the deep pockets to repair daily, or the ability to write it off.
The OP wants to buy new? I'd look at which sized machines I need, then find out amongst all of them which offers the longest ironclad warranty of the lot. Which one does onsite fixes the same day. Talk to owners of each brand to see if the dealer is worth their salt. Find out how much maintenance items cost for each machine (especially big ticket wear items). Lastly, fuel efficiency...plug it into a matrix to see which costs the less over a 2-3 yr span. Then look at resale values.
If I was buying new, I'd look at each machine and see which one had the biggest bushings/pins, the stoutest boom and arm, the one with longest runs of solid hyd piping, an engine maker with a history of longevity, biggest ring gear, least amount of sheet metal, best weather-tight electrical connectors, simplest hydraulic setup, minimal electronics, 2 ram blade setup, drive motors with a long life history and cheapest rebuild kits (same for main pump), centrally located grease banks, best weatherized and insulated interior, controls you can deflect with your body weight and they won't break, doors you can repeatedly slam without bending, and a machine that has easiest access to all the guts so one doesn't have to strip the interior to change the fuel pickup in tank.