I’ve had both. The V6 does not appear to have the same startup VVT actuator lock pin rattle as the 2.4. I don’t hear it in the 2.5 anymore so it could be resolved. I have a Chrysler 3.2 V6 and it does it bad. Every start warm or cold. I hate that noise.
I have a 2013 Jeep WK2 with a 3.6. 213000 miles and has had the cold start and hot start rattle a long time. Changed oil regularly, 5000 to 7000 miles with Valvoline high mileage. Last OC was Valvoline Restore and Protect. After only 500 + miles it has quieted somewhat already. I think it is lash adjuster noise in these engines. It is also a little peppier now. Gonna change out PCV and replace valve cover gaskets soon as it has started weeping prior to the OC. Will follow up after get them replaced. I always use 5w30, not the 5w20 called for on the fill cap. This is because I sometimes tow camper with it.
