Hi,
SAP from siemens will not make any difference as compare to other small institute unless you clear the certification.
Siemens charged the most among all the institute & will not give a job assistance if only you completed the training.
And for certification, you don't have to enroll in Siemens.
In my opinion, complete your SAP from any small institute where they can also help you in practical problem & configuration of SAP. Then work hard to clear the certification.
You can also choose peoplesoft HR version.That also is in demand.
But you will face major challenge as freshers in market, no one will take fresher.Minimum of 1 yr experience required.
Think about it again & then go for it.