TM or transom mount

I have a 999ci mounted up front on the trolling motor. I getting a new to me boat with a steering console. I'm wondering which would be more efficient, mounting the ducer on the transom or the trolling motor? I dont pay much attention to it when fishing.
Fin

If you are not using it up front fishing then it would be better to have it at the console.:twocents That way you can use it to see and find fish,structure,etc. while driving and use it also for GPS navigation and waypoints.:fish