The andouille sausage is actually less spicy than chorizo is.
When I've eaten andouille sausage and also chorizo the chorizo was much spicier than the andouille sausage was.
The andouille sausage has a more mild taste to it than the chorizo does.
Both andouille sausage and chorizo are spicy foods but the andouille sausage to me at least has a less spicy taste and flavor to it than chorizo.
If you have a cold or are congested then eating some chorizo would open up your sinuses and help ease the congested.
The andouille sausage would help some with the congestion as well but the chorizo would help much better.
Both andouille sausage and chorizo are good foods though.