hey mate, looks like you have a wagon. This is what happened with us.
We had a ute for a few years and always just had the gazebo.
We then had a wagon for a few years and had the awning. It was easy to use, always ready to go. No need to lug a gazebo on the roof and strap it down etc. Never used the gazebo when we had the awning.
Now back to a ute and we have no roof racks so the gazebo is back in business.
At the end of the day if I had a wagon I would probably have an awning again, with the ute we tend to like the gazebo as there is room to store it inside as opposed to putting it on the roof.
We really only use it at the beach. When camping we have a 30 second tent with their little awning or the camper trailer with the bigger annexe. Plus on our new ute we have a 3xm fleet series canopy with large lift up doors which offer some shade.
Time and effort to set up either is about the same with two people, gazebo maybe a little longer. Gazebo you can leave set up and drive around if need be. Never had any pooling in the rain issues and we have the old oztrail 3x3.
Cheers