I'm close to 38k on the factory Rubicon pads now. At a few thousand miles in, I started noticing a light squeaking that went away after some warmth from a couple of stops. At about the 12k mark, I switched to 315 ko2's on an otherwise stock jeep.
I added the Dynatrac 2" lift a couple k later. At about 25k, I switched to 38x13.5's.
At about 32k, I switched to the Metalcloak 3.5" lift. Now at 38k, I've noticed the cold squeak isn't going away with some warmth and an intermittent screach has begun. I decided to take the advice of a number of members here, and just ordered the powerstop z36 pads and their extreme duty drilled and slotted rotors. It comes as a full package, with all associated hardware and lube, from rockauto. About $400 including shipping and tax. I chose the cheapest FedEx shipping and its still gonna be on my front porch in under a week from ordering.
My 2018 has about 30K miles, 16K miles with 37's. The brake pads still have about 1/2 the pad left (a little more on the rears). I'm actually impressed with the life of the stock Rubicon pads. They seem like they'd last a good 50-60k miles.
I have a Power Stop front and rear brake kit (pads and rotors) waiting to install. Wanted to upgrade the braking system due to larger/heavier tires.
I too have had squealing/squeaking brakes, occurred at about the 10k mile mark. I disassembled the brakes and found all of the slide points and back of the pads to be DRY. I lubed those areas with Sil-Glyde and the brakes have been quiet ever since.
If you want to get the complete rotor & pad set that's not a bad thing, but I would just go with the Powerstop pads as long as your OEM rotors aren't warped (which is rare) or the thickness is down to the minimum spec. Should be able to get a couple machine turns w/ the stock rotors. You can also just scrub the rotors w/ some 3m pads if your pad deposits aren't burned on and aren't noticing vibration in the wheel when braking. Should be able to score those pads on rockauto for about $80