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It's a uni-ball design versus ball joint. Uni-balls are stronger but also more maintenance. They are a dry joint and are supposed to be cleaned regularly otherwise they squeak. Unless you plan on really beating on the front end off road you're better off with a ball joint control arm, or wait until ICON releases a control arm with their Delta Joint, it's like a ball joint uni-ball hybrid. The control arms for the 2018's fit the new 2019. I spoke with an engineer from ready lift and he said the arms will fit and the only difference between the two is the cup angle on the 2019 has changed a little bit. Several guys on this forum @VaderRebel being the first to do it, are using the ready lift 2018 UCA's on their 2019's without issue. I would assume you could use an UCA from any other manufacture that was designed for the 2018s however I think it has only been confirmed the ready lift UCAs for the 4th gens work for sure on the fifth gen.
It's not a ball joint, It's a uni-ball. Different animal, designed for desert racing and trickled into the mainstream and over kill for most applications not too mention a maintenance hassle.
