The main thing with a new building is to check out the developer, because deadlines often slip, and nobody wants to live in a half-finished house with incomplete work. Resale apartments seem cheaper, but they've got hidden problems: utilities might be on their last legs, the electrical system often isn't designed for modern loads, and the foundation can gradually settle. I'd look at whether the new building has good reviews from completed projects by the same developer, and for a resale place I'd definitely bring in someone who can see what's hiding behind the finishes. Plus keep in mind that in a new building after two years the repairs will still be fresh, but with a resale you'll have to redo at least some of it.