Seems to me from reading (and that is all I can base this on) that both 5 and 10mm pitches will work pretty well on most materials if set up correctly. I was getting all worried at one stage that my 5mm pitch screws would mean I was going to be burning up the wood I was cutting due to the low feed rates then I remembered back to when I started getting into all this lark seeing machines that cut wood pretty reasonably being driven by threaded rod with pitches so small you can hardly see them! Reckon our 5mm screws will be all right. But I may live to eat my words...