Guelph City is for the PS/FD and MOH traffic does not generally appear on that site. Guelph West carries OPP, MOH and other provincial agency traffic...it has a much bigger footprint than the Guelph City site.
I suspect the only reason Cam North ever showed up on Cedarwoods was because there was no Guelph West site for some time and many of those radios were using other sites (Cedarwoods, Ballinafad, Listowel perhaps).