gradle vs gradlew

[nomuna]

I have the same gradle version installed on my windows 7 machine as the wrapper (gradle 4.9).

I can generate coverage reports for a small grails 3.3.6 project using the

gradlew cobertura

But

gradle cobertura

doesn't generate any coverage info, just the website with index.html, css etc.

As a side note, I have the the option org.gradle.parallel set to true in gradle.properties.
I tested both gradle and gradlew with and without the org.gradle.parallel=true option
and get the same results.

Has anybody run into the same issue?