Functionally, there is very little difference between the two versions. The major difference is the barrel is slightly wider and lacks a dart peg, resulting in a very loose barrel fit. The sight of the Wipeout version is instead the loading point for the hopper.
In terms of power, the Predator is either a tier 2 or tier 1.5, depending almost entirely upon luck. They generally have tier 2 springs, but a couple have springs which are slightly stronger. The Predator will shoot stock darts a similar 45-50', despite having a much worse barrel fit.