I think n80 > kanthal for mech use, for sure.
N80's primary advantage over kanthal is its lower resistance per mm, and also lower resistance per gram. Running an n80 core in a clapton wire will give you more wattage to offset the extra mass from the outer wire, so it will ramp up quicker.
I think a lot of people (myself included) feel that kanthal/kanthal clapton ramps up too slowly.