Which is better? DBS or UOB or OCBC share?

None. Wait for the market to crash and possibly bank runs. Many banks around the world are on the brink of collapse. If any of the above banks you list survive after 3 months when the crisis hits, start buying any or all or them, sit tight for free passive income for the next 16 years.

All are good stocks paying good dividen

All 3 should be good

Financially and in terms of returns, DBS typically have stronger profitability and higher dividend yields compared to UOB and OCBC. At the same time, UOB and OCBC are more stable but tend to yield slightly lower returns historically.