Ive been trying luxrender a bit lately, and found some things better, but i prefer indigo renderer more. Mainly in the exporter could i find things that I like better in lux (besides procedurals).
1- In lux Mixed materials are only one material inside blender, you dont have to have 3 materials in your blender scene to mix 2 materials together. You only require one blender material to mix many luxrender materials
2- Using downloaded materials is easier, You can load the settings into your selected material, and all the settings will be visible and modifyable in the exporter (just as if you made it)
3- preivewing emitter materials?