Well, asians have some nicer colors than the jardinis. Also, asians have really big scales, while jardinis have a bunch of itty bitty scales.
They are different species, but same genus. There are four species of asian, and two of australian, but they're all in the genus Scleropages.
Asians and australians reach about 3 feet in length, Silvers reach 4'. Asians and jardinis tend to be less flexible and more bulky, while silvers are long and slender and elegant.
Also, jardinis are super mean, usually. I've heard some of the asians are too, mainly the golds and reds.