Hi Priyanka,
You can choose the methods, but remember the following points keeping optimisation and efficiency in mind-
1. Modules is in the same AAE so until there is a problem with AAE it will run.
2. BPM you have the dependency on BPE, if for some reason it went down and even if AAE is working message fails.
3. Soap Lookup - if the service you are looking up went down then even if PI is working message fails, even bottle neck on thread count is an issue.
Thus, for better reliability and easy tracking of your messages if you have modules use them.
Regards,
vikas