Weight matters more in small flats
In a compact HDB flat, you are more likely to use a vacuum for five-minute crumbs, hair and dust trails than for a single long Saturday clean. The V12's lighter body makes that behaviour easier: it is less tiring for ceiling corners, fan blades, sofa gaps and quick kitchen passes. The V15 still cleans brilliantly, but it feels like a bigger tool, so some owners leave it docked until the mess is obvious. If you already avoid heavy appliances, do not ignore the handling difference just because the V15 has the stronger spec sheet.