As the resale market prices start to lower, resale might be a better choice for you than BTO. With recent trend of buying a resale flat at ZERO COV (Cash Over Valuation), it also means you do not need to worry about paying cash upfront.
Location, location, location! Increasingly, new BTO projects are at far-flung places such as Punggol end (I mean units that are not even near to Punggol MRT), Sembawang (it takes years for the new MRT station to be ready) or Choa Chu Kang etc. If you have a tight timeline to follow, the ever-popular mature estates such as Ang Mo Kio and new town Bidadari provides you with no certainty of securing a unit. As for resale, you have the entire control over the flat you will purchasing.