The main point of the card is the make overseas purchases. Hence
international transaction fees and exchange rate charges are
important.
Second point is probably which has the best credit card points
redeemption.
Exchange rates are determined by the card company (VISA,
Mastercard) not by the bank.
On so-called international txn fees wise, in SG's context, it is
very similar between banks.
There is no best credit card points redeemption. Different
restaurants or retail stores may have more points for certain
banks' cards. Hence it depends on what stores you frequented.
Personally, I travel overseas with 2 credit cards. One VISA, one
Mastercard. Unlike SG, some stores overseas do not accept both VISA
system cards and master cards.
Locally, I usually bring a UOB, a citibank, dbs n hsbc.