Aspen Hysys and Aspen Plus and Pro

ASPEN PLUS

• ·      Aspen Plus Has Solids Handling Capabilities In It.
• ·      It Has An "Automatic Recycle" Capability Whereas In HYSYS You Have To Add Them Manually.
• ·      Better User Interface
• ·      Good For Polymers
• ·      Aspen Plus Evolved As A Chemical Process Simulator - It Is Very Strong For Simulating Non-Ideal Properties, Systems With Electrolytes, Solids, Azeotropes, And Chemical Reactions. It Is Also Strong For Modeling Large-Scale Flowsheets (Using The Equation-Oriented Approach).
• ·      Aspen Plus Thermodynamic Library Is Considered To Be Quite Extensive And Hence Considered Quite Useful In Simulation Of Fine Chemicals And Pharmaceutical Chemicals
• ·      Aspen Plus Is Better Suited For Chemical Process Design Whilst HYSYS Is Best For Hydrocarbon Process Design (Both Upstream And Downstream But Mainly Downstream). 
• ·      Very Absurd And Obsolete Dynamic Module.

PRO II

• ·      Bad Support
• ·      Much More Friendly - Easy To Set Up
• ·      Runs Many More Iteration With Just One Click As Compared To Hyssops
• ·      We Can Model Solids Inside It 
• ·      We Can Develop An Entire Spreadsheet On The Flowsheet To Perform Sensitivity Analysis And See The Result At Once
• ·      However We Have To Create A Spreadsheet For It For Specific Label On The Flowsheet
• ·      We Can Ignore A Specific Section Of  Flowsheet And Conserve The Rest And Then Converge The Remaining
• ·      Suplur Removal Unit Can Set Up A Unit Operator With Specifications At The Outlet
• ·      Crashes a lot more

HYSYS

• ·      Hard To Set Up
• ·      Good Support
• ·      Hysys Cannot Model Sulfur Recovery Units, Either. However, Hysys May Be Able To Do Some Processes Outside Of Oil & Gas, I Don't Know, Never Tried.
• ·      Hysys Cannot Model Any Sour Process Or Wet Process Very Well.
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PROMAX

• ·      Amine Sweetening, Dehydration And Sulfur Recovery Makes Promax The Best