Your front wheels will always look a lot dirtier due to the brakes working a lot harder. The dust tells me they are working well and Mopar OE pads is what I always recommend for best performance.
Also that's really any vehicle for you. The JL Rubicon has much more open areas between the spokes than the JK Rubicon allowing more brake dust to catch the outside face of the wheel. I've used both Mopar OEM pads and aftermarket ceramics on my Jeep and while it seems to me the ceramics generate less dust, the Mopar set definitely performed better