Well , The Question shouldn't be like this , Question should be " Based on what elements Can I choose the Most suitable Firewall"
First of all PIX isn't something you can think about it as a choice in the mean time , because it has been in the count of retro devices which isn't used that much those days.
ASA is the adaptive security appliance , those comes in many flavours and purposes, based on network audit and business needs you can select your suitable model of Cisco ASA series , First determine your goal of using the asa , then determine the scope of the process and so on..etc
Regards.
Nader Samir
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