Currently, EZSkin should work equally well in either situation.  But clearly understand, lighting plays a very intricate role in how the scene appears after rendering.  Gamma correction will brighten the scene, making it possible to discern shadow detail that was not possible in older versions of Poser.  Our eyes are more accustomed to see better under darken conditions than bright.  In non-linear workflow, users either added more lights to the scene to simulate what we naturally perceive, or add cheats to the material room to enhance textures to that stage.  Diffuse IBL adds ambient lighting based on a projected image, but once you add stage lighting (infinite, point or spot) you amplify the light intensity which looks correctly in a non-linear environment but becomes completely washed out when correction is applied without adjustments.

A linear workflow works better for me; I don't need to over think my lighting nor do I need to add multiple lights needlessly.  I alway strive for something that is very natural and realistically possible, not create an intentional imbalance unless I looking for dramatic overkill.