These two skis start with a similar idea - tip and tail rocker with traditional camber in the middle, and are women's powder skis. The online propaganda makes them sound about the same. The specs indicate some differences:
Rossi has a tighter turning radius (14 vs 18m)
Rossi a bit wider underfoot. (110 vs 100)
Atomic is slightly lighter and more easily set up for touring
Atomic is quite a bit cheaper
Atomic claims its "step down" sidewall provides dampening and better edge grip, although their website is woefully limited in information about what it is and how it works
Neither are likely to be available to me for demo, so am very interested to know if anyone knows how they compare in performance on snow.