What's the disadvantages of using webserver and appserver of different type?

If I choose webserver:iPlanet6.0 and appserver:WebLogic6.1 on one server, What's the disadvantages?
Mayby I will use the webserver and appserver of the same company.
I wish someone give me some advice.

As Barney-15E says, someone with physical control, can just remove the disk, and put it in an external enclosure, and mount the file system with their computer and access all the files.
Only encrypted data would be protected. There are data encryption facilities available on the Mac, both included, as well as 3rd party, including 3rd party whole disk encryption.
But having a password on an account, and engaging the password when the screen saver is active, can keep casual access from happening.
Also if you allow network access (file sharing, remote login, screen sharing), the password will keep random net users from accessing your system, when for example, you are in a coffee shop, or if someone gets onto your WiFi network, or you give a visitor to your home access to your network, or you allow a guest to use the guest account.

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