The advantage might be a cost saving measure such as sketchnoting using Sketchbook because you don't have colored pencils for everyone and you know that the use of color is important when making visual notes.
The advantage might be the ease of storage and retrieval such as using Padlet instead of sticky notes on chart paper where the adhesive dries out and the sticky notes fall off by the next day.
The advantage might be simply saving time by using a Gizmo for a math lesson because by the time you distribute the actual manipulatives the class is half over.
Even when working at the substitution level of SAMR, which is where my three examples fall, I would hope that teachers seek a purpose deeper than novelty and using the tech for the sake of using technology.
I'll keep trying but in the meantime, please don't ask me how you can use the iPads. Tell me what expectations you're hoping to work on, and I'll help you plan ways to get there. In most cases, technology will be a natural partner in our journey because it offers an advantage that you can't get any other way.