The ICY is very fast down the line but requires good technique to use well. Once you get it figured out it turns well and works in almost all conditions. I think it tends to work better for big guys. Worth considering if you don't have to have a short HP boat.
That said I really like my Aquarius and find it plenty fast.
However-------When all things are taken into account skill has a lot to do with boat speed. If you watch boaters of different skill levels surf the same boat the better boater always generates more speed.