NIchrome and kathal serve the same purpose, I think there is a slight difference in resistance , so you might have to adjust the length to compensate....... There has always been some that say Kanthal is better tasting, or faster in heating, or it might be the opposite.....
I dont know if one is better for lower resistances, but I do think that the cheaper throw away things like cartos and premades by kanger, etc used nichrome and when people got to rebuilding they thought kanthal tasted better.... WHo knows, all I remember is nichrome was less expensive?
I started with Kanthal because everybody seemed to say it was better at the time I started building my own....... Just preference.......