I'm eating a Chocwave right now. Pretty awesome. Snowballimus is okay, but I'm a big chocolate fan so I don't like it quite as much. There's not as much cream filling in Snowballimus and I like the frosting on the Chocwave.
I recently got a box of each. The Chockwave one's are definitely good, but the Snowballimus one's definitely aren't something I'll buy a second box of (sort of wish I would have grabbed a second box of Chockwave instead). Also wish I had found these earlier into the promotion. Doubt I'll get any more before the contest is over.