Well, I don't know a heck of a lot about the differences. I have used my Sandvik 396 XT {actually it's a JT} for many years now and it still cuts like a demon.
Here is a pic of some different blades. The top is the 396 XT {actually a JT}, the next is the Laplander, the next is the 396 XT7 which is supposed to be for hard wood and seasoned dry wood. The teeth are shallow, have an unusual pattern, and it is called an HP blade, which stands for Hard Point.
The bottom blade is a 396 JT blade and its teeth are longer, do not have an unusual pattern, and this blade is used primarily for soft wood.
The Laplander has the same tooth pattern as the 396 XT7 and additionally the blade is coated which theoretically reduces friction while sawing. What I don't know about the Laplander is if it is a HP blade as well. My old 396 XT looks like a JT blade with a coating. {BECAUSE IT IS A JT :-D }
So which is best I reckon depends on whether you plan on cutting a lot of green wood or dry wood.
Here is a link that might help.
http://www.rittenhouse.ca/asp/Menu.asp?MID=332