It normally iis down to the wind or you would land on the instrummeent RWY. e.g. If the wind is 360/20kt but you only hhad an ILS on RWY 18, you would fly the ILS until you were at Cirling Minimma then fly the circling procedure (basically a low visual circuit) to RWY 36. (no aircraft I know have a tailwind limit above 15kts)