Any aftermarket UCA, saved for the ones that are just stock replacements, will allow for more suspension travel when paired with a lifted application (lifted applications that doesn't relocate your factory LCA mounting points, longer hub knucles etc) as the arms are typically longer and/or offset, the reason for it is to allow more caster and give the BJ a better range of motion, asides from that, the biggest difference in price is craftmanshift, BJ style and bushing quality. Zone look beefier than readylift, bu that could be a moot point, BJ seems to be the same on both, don't know about the arm bushings on both and which one will last the most. Both will be better than stock for a lifted truck that have factory LCA mount points, both will allow better range of motion on the BJ, ideally to see which one will you prefer will be to have them both side by side, you could eyeball which one will allow for max travel/have better bushings or give you better caster, though given the application is standard travel, we're not talking about much difference between all of them unless you're comparing the ones with traditional BJ's vs uniballs., Remember the geometry/travel of the factory design doesn't change much if you don't change the lower control arm lenght and strut travel, tie rod lenght, uca lenght/offset with uniball etc, etc, so everybody is limited by the same standard travel variables, Uniballs will give you better travel, but they're not needed with standard travel struts, they're requreiment long travel setups, check for instance Dirty king LT setup,
https://dirtkingfabrication.com/collections/13-ram-1500/products/long-travel-kit-dk-541908-h
Attached is a picture i found with the Zone UCA vs the factory RAM UCA look at the difference in lenght, and they seem a little offset too from the angle of the picture.
