The inland plastic (Microcenter brand) has been easier to extrude for me. Its also more consistent with less variation in size than toner plastic. The down side is that it does string more. I suppose I should up my retract from 4.5mm to probably 5-5.5mm... Given the choice I will take the inland from now on, unless they change supplier and they ruin it. The black ABS inland brand is actually shinier than the tonner plastic and also sticks to the bed better with a thinner layer of goop.