I own every ball on the Motiv ball guide chart with the exception of the Raptor Talon and the Ascent Pearl. I also own a Venom Strike. I haven't seen a dud yet. Some balls get more use than others, and some only work for me on certain conditions. I tried the Venom Toxin last year, and after getting the Primal Rage, I knew Motiv was going to be a good fit for me. I beat my previous high average in 2 out of 3 leagues last year and had my best overall average to this point. And I had some good showings in tournaments as well.
If there is oil for it, or you are more speed dominant, then you can't go wrong with the Primal Rage. The Sting was my go to ball at one house last year. Not as jumpy as the Rage - at least how I have those two balls drilled. The Venom line works better for me at one house, but is also decent at the others. The Shock is stronger than advertised. I have mine with a motion hole so it definitely has some good pop to it. The Strike is a good early rolling piece, and the Toxin is longer and smooth. All 3 can be good benchmark balls depending on ability and condition. I also had success with the Revolt late last season at one house.