Both balls are nearly identical in strength. I have a Frantic and absolutely love it. That ball is going to be clean up front, gives you a good amount of length, and will be angular in the back. It's very good when the lanes start to burn up but have found it useful on a variety of longer and/or some heavier volume patterns. The Hy-Road cover with the N.O.S. Core is tough to beat.
The Wrecker is going to be similar and it has a great cover/core combo as well. Having thrown the Rising Star in the past, I can say that the Neutron Core does a great job of storing energy and carrying well. The difference here is that the Wrecker will go longer than the Frantic and be even more angular. It's more of the skid/flip ball. The Wrecker is also a little cleaner up front.
Both balls are great. If you want a slightly earlier read with keeping more of an arc reaction, go with the Frantic. If you want a hockey stick skid/flip reaction with a later read, go with the Wrecker.