Graham Irwin is a fellow board member of the National Passive House Alliance and shared this presentation with everyone on a comparison of REM/Rate, Energy Gauge, Manual J and D, and the Passive House Planning Package. I would suggest that it is an overview of all of them and general comparison.
As a nPHA Board Member and a Certified Passive House Consultant I would suggest the Passive House Planning Package. As the Passive House Institute US Quality Assurance/Quality Control and RESNET Provider for PHIUS we are in the middle of the REM/Rate and Energy Gauge software reviews John Steil has been key in making this work
Here are the links
Graham Thank you for the links!!