Thanks for the replies, gents. I was looking at Opt Offroad, their upper/lower link kit is like $739
There are others for more but Jason's stuff seems reputable. Front Range is another option I found for about 200 less ($513) without the Opt logo on it lol
Like
@Dezert4Runner said, comparing FROR to the Opt Offroad ones is not apples to apples. Heims suck TBH. They wear faster, make more noise, transfer more road vibration and put more stress on the bolt holes which will lead to wallowing out the holes if not corrected with weld washers. If I were to buy links, I'd go with Opt Offroad stuff for sure.
When it comes to adjustable uppers vs lowers, chances are on these 3rd gens that you will be making more adjustments to your lowers than your uppers. The UCA's are already close to the rear crossmember so lengthening them could cause bigger issues. (ask me how I know...) To correct the pinion angle you'll actually need to shorten the lowers a little bit. This shouldn't be an issue since there is usually tire clearance between the front of the wheel well and tire. Everyone wants to lengthen their control arms as if it will actually make a difference in geometry by increasing the length half an inch in either direction.
Hint: it won't.
Now when it comes to strength, having those Opt Offroad uppers is a great idea, but I wouldn't stress on the adjustability part since extending them half an inch might actually cause bigger issues.