Which is more effective for improving a double chin: Ondari Lifting or InMode?

I'm looking into both Onda and InMode because of my double chin.
They both claim to eliminate fat with heat, but I don't know the difference.

I have excess fat and my skin is sagging. Which of the two would be more effective?

I am wondering if I can return to my daily life immediately after the procedure, and if there is any swelling or side effects.
Do I need to have this procedure done multiple times for it to be effective?

I'm curious to hear genuine reviews from those who have had the procedure.