Explanation: Externally Managed Gateway means a checkpoint managed gateway (VPN based on certificates). Interoperable device means gateway from another vendor.
In the absence of the question providing more detail about the 3rd Party device then A seems to be best bet:
"Externally Managed Gateway" should be only Check Point devices (with GAIA installed). This will allow you setup VPN based on certificates.
"Interoperable Device" should be created only in case you need to establish VPN with another vendor.
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