Generally, Ibanez Prestige lines are the best. They are being made in Japan. The highest quality also correlates with their high price tags, which only surpassed by some signature models created for a few famous players. Although, if one would compare the equivalent products from USA or European factories, Ibanez Prestige lines could still be considered cheap. Get one if you have the money for it.
But, the Premium lines are also top notches. They are the highest grade products that came out from Ibanez Indonesian Factory. They are generally priced below the Prestiges, but still higher than Ibanez standard lines. A lot of folks swear by their awesomeness and would say there could be no wrong if you have gotten Ibanez Premium line also.
As of now, I own several Ibanez products: 8 electric basses, 1 acoustic electric bass, 1 electric guitar, and 1 acoustic electric ukulele. None of them belongs to the Prestige nor Premium lines, or in other words, they are the Ibanez standard lines. Most of them were made in Indonesia and the others were made in China. Still, they are joy to play and none of them have made me regrets in owning any of them.