c++ - win32 process termination detection: WMI vs. WaitForSingleObject

Question

I am writing a windows service (c++) that need to detect specific windows process termination.

I thought about two different approaches to detect the termination:

1. Using WMI as described here.
2. Using winapi WaitForSingleObject(hHandle, INFINITE) function on the process' handle.

The obvious difference is that WMI uses a CALLBACK function.

What are the other major differences, advantages and disadvantages, between the two approaches?

Thanks!