The PCB manufacturing house that I use says the board thickness between 0.4mm and 1.6mm are the same cost (I have 2 layer design). What is the benefit of having thinner or thicker board thickness for FR-4? What I guess is that thinner is lighter, but may be problematic on pick & place machine (bending), thicker may be good for separating the signals away.
Could someone who is experienced in PCB design/fabrication explain how to select the thickness of the board (e.g, why do you select 1mm, or .8mm or 1.2mm, etc.)?