It might be premature to give my opinion since I just got the Ohana today. They seem good in different ways. But Ahnko asked in the other thread so here's what I've found so far:
The Ohana is louder in volume but I'm not sure if that has to do with the strings. Russ said the Ohana's have Aquilla's and the Manini has black flourocarbons (bbycrts was not sure of the brand but he thinks they are Fremont.) Both were set up by MGM so I'm assuming he put what he think sounds best on them.
Both have a bright sound. When strummed, the Manini's harmonic range is high, very treble-y. The Ohana's harmonics are more full. But when picking, I like the sound of the Manini - the Ohana sounds too much like a banjo.
As far as styling, Ohana looks traditional while the Manini has an artistic flair.
That's all I can think of so far.