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I have three Pelicans in different sizes, all with the dividers, not foam. I like the dividers because it's easy to reconfigure the case for the gear to be used on a particular outing, and as my gear changes over time. My cameras and lenses have been well protected in jolting movement as harsh as any boat is likely to dish out--such as a pickup truck barreling across thousands of miles of washboard roads (where you need to keep your speed up to surf the crests of the bumps) or bouncing, (a bit more slowly) on mountain two-track where my head sometimes hits the ceiling of the truck.
Remember that is is pretty easy to arrange the dividers so that a lens or camera has a very snug fit. My gear is not rolling around within the dividers, and after years of such travel, I have no sense that it is stressing my gear.
I do make it a point to place the case on top of something soft whenever possible--a foam sleeping pad, upholstered surface, or whatnot--so that some of the vibration is dampened before it reaches the case.