Some vehicles can be fussy about aftermarket parts. Some aftermarket parts are not made within the tolerances required for said vehicle. My truck as an example does not like anything but OEM plugs or it runs like crap. I am not too sure about the Jeep yet. I always go with tried and true products to save hassles down the road. Unless several people here can tell you that brand X plug works well in your 3.8 then I would use Mopar plugs etc. as you know those work already.
2013 Jeep Wrangler Sahara - White with Black Hard Top - Auto Trans, LSD with 373's, Remote Start, Mopar Hood Lock with Grill Guard, GraBars, VDP Stubby Front Bumper, Daystar Leveling Kit and Griffin Steering Attenuator.