Been machining for about 20 years now and of the 3 places I've worked we've always had Okuma's. They are in a word--reliable.
The only time we've ever had to have them worked on is when somebody has a bad day!
Never been around any Daewoo's so really can't say about them..
If you can afford the extra $18,000 I,d say you'd probably be better off with an Okuma. I know one thing for sure---you wouldn't be disappointed with the quality or the performance of the Okuma.
Sometimes though we have to let our decisions take a back seat to our pocketbook!