In my opinion, the Okuma is the toughest and longest-lasting of the above machines. I would rank it right up there with a Mori or Nakamura.
The Mazak is not bad and we've got some Mazaks in out place that are 18 years old and still running 3 shifts/day.
The Hardinge and Daewoo are not quite up to the same level but not bad machines. If you are putting them in a job shop any of them will last for years. If it will be used for 24/7 production, buy the Okuma.