I have '29 and '58 carbines. My brother has a '72.
The '58 is the smoothest, and the internal polishing of parts is superior to the '29.
The '29 is a fraction lighter, and is nicer to carry thanks to the more rounded receiver bottom. Also has the best trigger pull.
Functionally, the '72 is the near-equal to the '58. Aesthetically, it has some issues, mainly the sintered metal receiver and very plain birch (?) stock. I've had to replace a broken firing pin on it, and it was easier than it would have been on a pre- '64. There are some pretty significant design changes between pre- and post- '64, none are really for the better, but just to make it cheaper.
I haven't even laid eyes on a Miroku, so have to reserve judgement for now. I lost interest in '94's after they added the cross bolt safety and angle eject.