It is going to depend a bit on the application, but in general, rod ends are an excellent bushing for a performance oriented setup. I run all rod ends in my own car, and you will get a bit of what they call "NVH," which stands for Noise, Vibration and Harshness, but frankly I wouldn't let that scare you.
For applications such as the GM A-body cars, late model mustangs, or any other setup that uses a converging four link deal, one bushing type to stay away from is the delrin type, or poly. The reason is that the trrailing arms need to move in two different axes, and these types of bushings bind up pretty bad in those applications. For them, two choices: rubber OEM type, or rod end/sphericals.
If you are going to run rod ends, get high quality ones, the "XM" series from QA1 are excellent, strong, wear well, and are a lot more affordable than Aurora's, NMB, etc.
Mark
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