I'm looking to build a bench top gantry style CNC router and looking at existing designs there seems to be two options for the Y axis, either a moving gantry or a moving work bed. What I've not been able to find are any pros and cons as to one option or the other. Can anyone advise or point me to any discussions that might help me choose which option to go for. I've tried searching but I've not had have much luck. Or is it just personal preference?