Jesus which one do I use for an /dp and why doesnt the class all use the same thing ?.. thread evolving.
Your AN/DP instructor will almost certainly tell you which one to use. My TDI AN/DP class was all told to buy Multi Deco and we used that for the whole class.
I wish I knew more of the dive planning that happens in an/dp.
Get Steve Lewis' book, The Six Skills. That will tell you a LOT.
https://www.amazon.com/Six-Skills-Other-Discussions-Solutions/dp/098122802X/