[Great68]

Disclaimer: I don't sell or install any heat pumps themselves, I just have to work with and control their operation in the commercial/institutional sector.

I would agree that Mits & Daikin are kind of the cream of the crop right now. I run a Mits in my house, it's been fantastic so far.
See a lot of Samsung installations happening as well. The asian style units are really up there (the side blowing condener style) in popularity.

I don't know anything about American Standard, never seen them in my line of work.

Trane: Meh, not the biggest fan both commercially and residentially. My uncle has a 5 ton XR unit (the vertical style) It's fucking noisy. It has broken down and needed service a few times now in 15 years.

I feel like the North American stuff is just a generation behind the ball to the Asian stuff.