3dp xyz axis

Hello forum,I just join this informative forum. I am in process of building a DIY 3dp using openbuild linear actuator parts fort of my 3 x/y/z axis. My z and y axis are both lead screw and x axis is belt driven. My Z axis lead screw has 2 mm pitch which was recommended by most people in this forum, for accuracy and less needed torque. what about y axis, which needs faster movement, what's a good compromised pitch: here are my choices 2/4/8 .Any recommendation? or I have to use belt instead? Thanks