In terms of dividends, which blue-chip bank should I invest in? DBS, UOB or OCBC?

On top of dollar dividend, I think what is more important is the dividend yield. i.e do take into account the entry price when you buy the stock as well!

High dividends is good, but remember your purchase price is important too.

As of today on Bloomberg for the bank counters dividend.

DBS 4.9%pa

OCBC 4.09%pa

UOB 4.11% pa

If you will want the highest dividend, dbs will be the one to invest in.

However, this might not be the best strategy to invest.

Look for company with good fundamentals., good track record, business that you understand, understand what is a good price point to enter etc. These are more important questiosn rather than just looking for pure dividend.