The first variant is definitely correct.
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Kelly TanAre all the sentences OK?Yes.
Kelly Tan which is the best one and which is worst?The second one is less common, that is all.
Persian LearnerWhat about the following ones?Petrol in Malaysia is cheaper than that of Singapore. Petrol in Malaysia is cheaper than for Singapore.The preposition is a wrong choice in the second; the first is just too clunky.