Physical firewall layer question

[Bennett Samowich]

Greetings,

Are there any issues, pro or con, to having two physical firewall machines 
making up the perimeter versus one?  If building with two machines should 
they be the same or different?

Scenario A:     
              ,->DMZ
Net->firewall
              `->Internal

Scenario B:
                ,->DMZ
                |
Net->firewall---->firewall->internal


Thanks in advance,
- Bennett

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