[Superman]

Neatrix is going to flex more than polybronze, but I would not expect an effect that is similar to using different tire brands on different axles. Whatever you've got in the front, I would think you would be free to chose whatever for the back.

Strut bearings can make a fair difference in terms of noise and perhaps polybronze bushings might be a little noisier, but I question that. I wouldn't be surprised if the noise level of polybronze spring plate bushings is essentially the same as Neatrix. Really, the difference would mostly be in the degree to which the syspension is allowed to flex. Less with polybronze. In other words, I would expect the polybronze to deliver the most predictable and solid handling. Without much of a noise penalty.

Then there is the "stiction" thing, which I substantially dismiss.