Wondering the difference in these three utilities. All seem to attempt to accomplish the same thing, analyzing a gravity storm network. I see that SSA is most advance and can export results back to .dwg, and also has ability to include pumps.

I am analyzing an existing storm sewer system, prefer to use Analyze Gravity Network (AGN). Seems to be the simplest, and quickest for what I need. I did however attempt to export and run the model in SSA and got totally different results. AGN had surcharging at each Drain inlet, with pipes running under pressure, and SSA had pipes not even half full. Comparable flows in each. Also, in SSA you can specify a max design flow, but once the model runs, max calculated
flow does not reach this value?

Thanks.