Introduction: I have beautiful tennis strokes and can teach so many different shots. That being said, it really comes down to what you want to accomplish and your comfort level with a particular stroke.
For instance, if you have a certain way of hitting a shot then we don't want to overhaul the entire shot unless you are willing to embrace the transition to a new shot.
I believe it's best to show someone how the shot works and how you can implement this shot/stroke. It's important to work with the individual and their ability. Trying to help someone both get better and enjoy the sport not trying to get them on the ATP tour.
Love love tennis.