The black leather seats in my '15 Limited are some of the worse I ever had in any vehicle. The leather is pretty stiff and just doesn't feel right. The second and third row seats are fine, it's just the front two.
Either way...The leather is coated so conditioning won't do anything. You can apply a conditioner everyday if you want to and it won't change a thing. You can't condition plastic. The best thing to do is keep them clean. I hit mine every couple of months with a dedicated leather cleaner, but usually just maintain them with any kind of "all in one" leather care product. Lately I've been using mothers vlr, but I've also used poorboy's leather stuff and the chemical guys leather detailer. I like the spray products cause I can knock it out pretty quick.
That means what you actually like is the vinyl