In many cases where a Trusted Platform Module (TPM chip) is employed, it is soldered directly onto the motherboard. Ostensibly the motherboard manufacturer is then solely responsible for integrating the BIOS and TPM module, and the overall tamper resistance of the solution.
TPM modules are also available as add-on daughter cards, which plug in to a small 19-pin connector on the motherboard.
From a security perspective, is one solution clearly better or worse than the other? Is there specific functionality one should look for in the BIOS or the TPM module when a daughtercard TPM is used?