Twin Axle motor mover help?

Hallo all, first time ever on here, just collected our caravan yesterday and looking to have a mover fitted, but have rcvd conflicting advice from retailers between the Powrtouch twin manual or the AWD? has anyone any experience with either? It's £700 extra for the AWD! we have an Elddis Crusader Tempest, twin Axle, many thanks for any advice...