The author tried the most expensive drinks from Luckin Coffee and Starbucks in Singapore's Central Business District.Aditi BharadeLuckin Coffee, which has put up a strong fight against Starbucks in Asia, is looking to the US.The Chinese coffee brand, known for its heavy discounts, reported a strong third quarter.Analysts say Luckin is a force to be reckoned with.Luckin Coffee is putting up a strong fight against Starbucks in Asia.