Hi Soma,
This could be a big topic with already lot of things researched on this ,
I will try my best to answer these questions from my knowledge, I have seen two cases where SAP PLM was chosen over Teamcenter.
2. What are the advantages of Team Center over SAP PLM & ECM?
Answering in reverse for SAP PLM, OOTB integration with SAP ERP.
Common Infrastructure.
Strong commitment from SAP.
Broad range of new PLM Products now available one example Visual Enterprise from SAP.
3. What is the version of SAP PLM available in market?
SAP PLM 7.02 (PLMWUI702)
4. Can I use my old licenses with the new version of SAP PLM & ECM?
You need to individually check this with SAP. typically it requires seperate license, within SAP PLM there could be different options for license, e.g. Engineering Record.
5. It would be difficult to say without knowledge of scope and your PLM strategy.
Thanks and regards,
Niketan Maral