Hello,
I am a PCB Designer for almost 4 years. I've done many projects, especially high-speed backplanes with EMI requirements. I use Altium Designer. I also have some beginner experience in PADS, but for this project I'll use Altium. I usually use PADS for high-complexity backplanes.
For more exact delivery-time, I'll have to know what is the file-type you'll give the schematic/netlist, do you already have a layer stack-up or of you know which is the required controlled impedance for the differential signals.
Thanks!