I have a Givi Airflow and a GS Adventure windshield with Touratech spoiler. They are about the same with regard to wind protection / noise. The GSA shield with the spoiler is actually even a little bit better than the Givi.
Planning on keeping that combination. The spoiler will only get attached for longer highway runs. Below 60mph I can certainly live with the GSA shield alone. And it looks good, doesn't vibrate as much and is more scratch resistant than the Givi. Okay, price is steeper ...
All that on a standard GS with GSA winglets and Tobinators.