We are lower-middle income family going to start our BTO renovation soon. Which credit card would be best for large purchases like these? Should we play cashback or the miles game?

How about use an EVol and OCBC credit card to get higher interest for your savings account?

It depends if you plan to take the whole family on a trip with the miles or if you rather get rebates for your family expenses

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I think it is a good time to sign up for a new Credit card. Check out the current promos such as Citi PRVI or Amex true cash at 3% for the first 6 months

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as mentioned by some of the others here it is critical to check it cc is accepted else there is no point in the sign up.