Ahhh, this is a great one. It's like a discussion I had with my college roommate about women. He says, "they're all crazy. . .you just have to determine how much crazy you can put up with!"
There are so many factors in play for ride quality it's difficult to list and deal with them all (bushing size, material durometer, spring rate, shock forces, etc)
In general:
Large rubber bushings will provide the best ride quality by absorbing the forces induced into the suspension from the road. However, this deflection also means your alignment settings will change when you push the car hard enough as the control arms will move a bit.
Smaller rubber bushings won't let the arms move as much, and will still provide decent isolation.
Poly bushings provide less isolation, but your settings don't change as much (and they tend to make noise if not properly serviced).
Delrin (or basically solid) bushings keep the arms where they should be, but transfer a lot more noise, and vibration into the car.
We, at Ridetech, are switching a lot of our performance applications over to a Delrin bushing we've developed. It's injection molded out of Delrin with Teflon added. This provides a self lubricating bushing that requires virtually no service while supplying the best possible handling solution you can live with.
They do transfer more forces into the vehicle, but in a performance car this is more or less considered "road feel" and is looked at as a good thing.
I've logged a bunch of miles on our 48 Hour Camaro; a ton on the highway, but we still drive it to lunch and around town quite often. It's easy to live with daily, and doesn't beat you up any worse than a "performance" spring rate.
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