what is the difference between PIO and OCI?

which one is best to live in india?

PIO is valid only for 15 years. OCI is valid for a life time.
PIO requires you to register at the local police station in India if you intend to stay for more than 180 days. There is no such requirement for OCI.

You cannot vote with either PIO or OCI in India.

If you plan on living permanently in India, OCI surely is the way to go if you qualify for it.
 
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