Engineering expert please help!!!

[omli]

hi,
I am a process engineer in an oil and gas engineering box, for many years we use the design II; and now we want to buy a new simulation software, what you recomend ?? aspen? hysys? or ??

please help? with avantages and disavantages

thank you

[kp2008]

Before i used Simsim Pro/II, and Now i use Aspen Hysys for Oil and Gas, If you hve job in refinery or petrochemical you should use Aspen Plus...

[omli]

thank you kp2008