[JLMounce]

I always recommend either staying with Rubber if you're worried about NVH, or going directly to Delrin bushings. Poly bushings can have a tendency to squeak and while they do offer more resistance to deflection than Rubber, if you're driving your car in a way that you're worried about that, you should have solid bushings and eliminate all deflection from the bushing.

I've been running solid bushings for years and there is no discernable increase in NVH that I can tell. I had PST polygraphite stuff before that. It's been my experience that people that state the car will get harsh with solid suspension bushings have never spent much of any time in a car with them.

Defaulting to the two ends of that spectrum, if you are at all worried about NVH, stick with rubber. If you are more concerned with handling, go straight to Delrin bushings