I live in Oklahoma and run heim UCA’s right now. I️ prefer the design and haven’t noticed hardly any wear. If I were to go SPC it would only be to save money i think.
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While I have no experience with them, keep in mind any control arm with Uniballs or heim joints will have a reduced life in environments with any kind of harsh winter environment as compared to a standard sealed ball joint or bushing. That's why I went with the SPC Uppers.
Great guys and they make some awesome components. I've installed several sets of their CJD uppers on both stock width and swapped frontys and Xs. They are a little bit heavier than the PRG UCAs but the build quality is top notch and their cust service is excellent.