rockwool vs 703 fibre for acoustic panels

Hi guys, i want to start buying and building my acoustic panels, what would be the better option for the panels - rockwool or 703? I want to make 100mm depth panels (bass) aswell as 50mm (mids) and 25mm (highs) panels and then put them in order with the bass ones in the center moving outwards towards the shallowest panels.

oops... sorry wrong forum....... my bad!