You should use different overheads (Bandeja, Bajada, Vibora, Rulo, Smash, Gancho) depending on the opponent's lob depth, the ball's position relative to you, and your primary goal for the shot, focusing on correct technique, timing, and aiming points for each.
This is a really useful breakdown of all the overhead shots in Padel. The coach does a great job explaining not just how to hit them, but more importantly, when and why to use each one. Understanding the purpose of each shot, like recovering the net with a Bandeja or attacking with a Vibora, is crucial. Pay close attention to the specific tips for each shot; they can make a big difference.
