ARFoundation, what's the best practice for displaying multiple models

Hi there, I'm using the example ARFoundation code from GitHub. All works well for both Android and iOS.

I'd like to know what the best practice to switch modelA to modelB in an active AR session. To clarify:
- user starts the app
- user finds a plane
- user presses on the screen to place modelA
- users presses on a UI button and replaces modelA with modelB

I can think of many different ways to attain this but would like to know what the most optimal way to do this.