I want to add that a couple years ago, I went with Juin Tech because they seemed to be a good compromise that let me use regular STI brake levers, and was a good price compromise versus purchasing expensive levers like the GRX.    As many of us know, mtb. bike hydraulic brake levers are all based on mounting to 22.2mm flat bars, and road bike/gravel bike bars are 23.8mm diameter.    This makes mixing and matching hydraulic brake difficult.

My recent discovery and direction I am heading, is swapping my flared out gravel bars out with the Zinno carbon "H" bars.   (Link below.)  Then I have been using the Pro III hydraulic 4-piston brakes.   Overall, for the 29er hardtail I installed this approach on, I have been very pleased.   I purchased another set of Zinno bars and will upgrade to this same approach.

If you are building up a new ride and are in the planning stage, I recommend looking into this approach.  (Some riders don't like the shape and less drop/flare of the "H" bars.)

https://www.aliexpress.us/item/3256804059388076.html?spm=a2g0o.order_list.order_list_main.147.6f7d1802PhNG9i&gatewayAdapt=glo2usa

https://www.aliexpress.us/item/3256804577690212.html?spm=a2g0o.order_list.order_list_main.10.6f7d1802PhNG9i&gatewayAdapt=glo2usa