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Both kits are VERY nice.. the CST comes with new upper control arms with uniball joints instead of the stock UCA/ball joint.. That is a big plus but i also think the cst is more money..
Ive also heard that the CST might not net you a full 8" but im not totally sure about that..
I'd rather go with the Rize. If you're that worried about the UCAs, just get Camburg's new UCAs when they come out. Rize has better angles than the CST does, otherwise they are both excellent kits.