Being I have met both of the individuals discussed in this post, I thought I would chime in.
I met and BSed with Jerry Jardine this month while on my vacation. I also have his system on the White Obsession. I have been very pleased with the Jardine system, their prompt customer service and after talking with Jerry, just confirms that he runs a first class business and builds quality exhaust systems. And I must say I love the "Deep Throaty Sound" with no drone.
I also know Rip! Rip is a great guy! I have seen and heard his system, and I can tell you that he builds a quality system (as Jardine), and if you have him install it for you, it is a first class system.
I haven't had the opportunity to stand outside on the road and have both system drive by so I could listen to them, but I can tell you that both systems are quality systems. Jerry Jardine has been around for years and has an excellent reputation and warranty. I'm not sure what Rip's warranty is, however I know he will take care of any problems that occur.
Having said that, I think both systems are great and which ever one you choose, you will receive a quality product that will provide you many years of service.