The Rocket is the bigger brother to the Reaper, sporting 12" skirts and with a bit more length and diameter it will create a bigger profile thus entice a bite from a bigger predator.
Being a larger pusher the Viper Rocket is a super easy lure to swim and will perform in all positions in your boats wake and really comes into it's own in marginal conditions where it will hang in there when some of the smaller offerings are getting blown about.