Rocky, Welcome.
This is my take, after a little over a year learning from the guys on the forum, Howard's FAQ, the HI Site, and many, many Nepai sites on the web, just for background.
"The" blade began as a weapon, dropped off in the area when Hannibal passed by. It has been developed across the varied terrain of Nepal by farmers, village kamis, warriors and armourers. Most of it's development was as a daily agricultural tool, but it was always flavored with the probability that it would be needed as a weapon. Some are weighted more in one direction than the other. Another major factor in development was the terrain in which a given style either "began life" or "outlasted competition" in any given area. Then, just to confuse things, each blade's area of influence began to overlap many of the others. The mix is also spiced with designs intended purely for the military.
Finally, what HI has selected to make, falls into two broad groups - wide bladed choppers, and the leaf-bladed slicers. Both overlap each others' abilties, but the slim blades developed in viney, grassy areas don't chunk firewood well, and the big choppers don't build as much speed, and won't cut springy brush and vines. Sizes, IMHO, are like clothing sizes - Heber wears a 25" AK (and pretty well dressed he is, too

), but I'm a size 15-20 in most blades. The Ganga Ram is the chopping king, at one end of the spectrum, and the Kobra is probably the slicing/slashing king at the other. Yvsa's Cherokee Special is a heavily fullered wide blade looks like a chopper (and is) but is light enough to build speed for slashing (and does). The fun comes when you get (as you propose) one from each end of the spectrum, and then start working toward the middle.