There are two factors that come into play with the plaster/render vs drywall choice: 1. Labour vs material cost, increasingly it's cheaper to drywall rather th

There are two factors that come into play with the plaster/render vs drywall choice: 1. Labour vs material cost, increasingly it's cheaper to drywall rather than render/plaster a wall. It's quicker, therefore if Labour is expensive, it works out cheaper. When you also look at running services the gap behind the drywall is useful and saves masses of time. 2. Insulation, both thermal and sound. The small air gap behind the drywall forms an additional layer of insulation.