[Borden]

I always doubt whether it's a good idea to adjust the lower control arm to get a camber we want. Besides the control arm, there's the lateral link and trail link in the lower portion, so once you change the length of the lower arms, you must adjust the lateral link to maintain a proper toe, and I don't know how the fixed length trail link will affect the geometry, but I think there must be some.

I think it's better to adjust the upper A arm, since it's the only arm in the upper portion, and its joint point is almost right above the driveshaft, so the side effect of adjusting it can be minimal. And the stress on the upper arm is way smaller than lower arms, I think maybe that's the reason why people usually prefer to have the upper arm adjustable in a double A configuration.