IBPS PO recruits officers for public sector banks, while IBPS RRB PO (Officer Scale-I) recruits officers for Regional Rural Banks.
Both selections have prelims, mains and interview stages.
RRB PO postings are mostly in rural and semi-urban areas, while IBPS PO postings can be anywhere in India.
Both need a graduation degree; RRB PO usually needs proficiency in the local language of the state applied for.
Pay scales differ between public sector bank POs and RRB officers.
Choose based on where you want to work and the banks you prefer.