"You want to try?" is an incorrect way of asking a customer to try a product or a service.

It can sound abrupt and hostile, especially to foreigners or customers who are unfamiliar with the way Singaporeans tend to shorten our sentences for convenience.

“Would you like to try that?” isn’t much longer but it sounds a lot more polite and makes the customer service person sound friendlier.

Source: Edited from the Singapore Retailers Association's Speak Good English pamphlet.