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There is no straight answer to this. A useful place to start looking would be to study URA’s Master Plan: Master Plan (ura.gov.sg) The Master Plan will give you an idea of upcoming developments in different parts of Singapore.
After that, you have to consider your own finances and plan around the best type of property that you can afford: most Singaporeans usually plan around BTOs, ECs and resale HDBs, as they tend to be more affordable.
Hope this answers your question.