My other concern is strengthening a part designed to be soft and re-directing strain to a part that wasn't designed to withstand it. For example I used poly exhaust bushings on a Nissan I used to drive to reduce exhaust sway and ultimately cracked the exhaust piping at the hanger, because that was now the weakest point.
Full disclosure: I have not done a FEA on the LCA so it's simply an observation; these are stout control arms. I'm not remotely concerned about the impact switching over to the orange Polybush has had on the longevity of the control arm. Furthermore it doesn't appear that they are connected to anything that's less durable than them.
As to squeaking; my polybush do not.
I would opt get what makes you comfortable between LR and OEM - either one will be just fine.
Cheers,
Ian