You can minimize the noise some with Dynomat or similar material. The base issue still sits there though. Metal, while lighter and cheaper, is noisy.
A.R.E. caps are made by the same company that makes Pace caps. Comparing my Leer cap on the 2019, the cap I had on the 1998, and the Leer I had on the 2011 before the current Pace cap, I don't notice much a difference in quality. The Pace was significantly less expensive than the Leer. I think there may be a bit of brand name premium with Leer over the other brands.
The Pace in 2012 or 2013 was $1800 for the 2011 with a 6 foot bed. The Leer for the 2019 with a 5 foot bed was $3000 in 2019. Granted, it did have a couple of amenities like carpet lining a power block, top net, and lights that come on when the hatch is open but the bed is 12 inches shorter and the cap is at least 4 inches shorter due to the height of the bed sides. The Leer I bought before the Pace cap for the 2011 was bought off Craig's List for $300. So, I have no Idea how much it would have cost new.
Both came with a reinforced roof and load bars. So, with a significantly smaller cap, I don't think seven years difference in purchases should make that much of a difference in price.
Other manufacturers have probably come up with their own products for the 2019+ Rangers by now. While I do like the Leer in many ways, I would encourage shopping around.
One thing I do not like about the Leer, with the fold down front window option, is that is is not captured. So, unless you are careful, the window assembly will fall out if you don't hold it. The Pace design is much better.