mt local shop has these both in stock and on sale for $350ish
so i did a thread search and this is what I am guessing:
Karma - stiffer and wider so better in pow but less so in park
Addict- better switch b/c true twin, and the only other thing is that people seem to really like the ski but I do not really know why
i am 6'1" 170, I like to charge hard out of the park and I am aspiring but more tame in the park.