I think it really depends on your spending patterns...
fuss-free cards mostly come with lower rebates/cashback (low min. spend, fewer restrictions, etc.)
- SC Unlimited (1.5%)
- Amex True Cashback (1.5%)
- Citibank Cashback+ (1.6%)
- UOB Absolute (1.7%)
above are some of the favorites?
cards with higher cashback/rebates come with more conditions (higher min. spend, capped for certain category of spending, applicable only for online, etc.)
- so many different conditions that it's difficult to list objectively
can "window shop" to see the various types of cards before choosing one that suits you the most, not just what everyone else has. can look at some sites like singsaver or seedly or moneysmart to compare...