SBI PO is better than RBI assistant due to the following reasons-
It is the highest paid govt bank job at entry level.
SBI is the most widely known India's commercial banking brand, almost 179 branch are outside India ,so option to work abroad is also open.
Promotion is fastest among the any govt job, one can reach up to General Manger in almost 15-18 years.
Allowances paid for SBI PO is highest among the PSU jobs.
One can join pvt firm or MNC bank after CFA, FRM or MBA(correspondence) with 5-6 years experience for higher salary.
Hope you got your answer.
Thank you !!!