Tomeytos think that corona is though differently from other render engines, the default settings are thought to work as the best settings for most of the situations, interior or exterior, since it is an unbiased or nearly unbiased render engine, there are not complex settings that will make a super difference like in vRay or Mental Ray.
Anyways check the manual and play with the settings and you will see this by yourself, but if you don't have time to do that, go with default settings, they work pretty well in the majority of circumstances.
Cheers!