Credit Suisse is a BB so it's hands down best of the 3 in terms of pay, prestige and career opportunities. Rabobank is a large European bank with a global presence while OCBC is a local bank with less than half of Rabo's market cap and hardly any presence outside of SEA and maybe Greater China. Credit Suisse and Rabo are global brands while hardly anyone outside of Singapore know what's a OCBC.