As TD has suggested, I don't think there is a better sub 90 ski than the Watea out there when deeper snow is the target. There are certainly a lot of 88ish skis that offer maybe more versatility in other conditions than the Watea does. (in fact, I don't carry the Watea anymore because of this fact). Still it is a very viable choice when the priority is deeper snow on a narrowish ski. The Aftershock is one of those skis that is more versatile than the Watea when all the factors are considered, but it's not better in deep snow.
Humor just a bit more.... What are these "other" conditions that other 88's are better in? The W84's (for me) already have a fierce edge grip and are highly manueuverable - the downsides are stability and the hooky tip. I don't necessarily need to improve on the W84's deep snow performance I just don't want a diver (i.e., a wide carver uber-ski). And as far as the W84's stability - I'm not talking about at speed, but over rough terrain (the W84's are the polar opposite of damp, which is why they are light and lively to begin with...but I could give up a "bit" light and lively...there I go again...for a bit more stability...or I could just stop posting and get to demo'ing).