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Hard plastic/rubber is right out. They tend to squeak and suffer worse performance than the spherical bushings with just as much harshness. They last until you get fed up and replace them.
The Elephant/Rebel spherical suckers make your ride softer and more predictable, with the possible down side of increased road noise (though from my own research here, it seems like this isn't noticeable or everyone who installs these already has a loud car). My pick is RR here, as they don't require greasing, but I have yet to drive on a set of either.
Rubber is rubber. Pretty damn good for a decade or so.
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