$100 cheaper (assuming an ipad mini 256gb wifi)
much more battery life
much more storage at the base SKUs - you get 512 locally, albeit in 2 buckets.
You can use both screens simultaneously
iPadOS despite limitations is still better for multitasking.
You get the triple camera system.
Contra:
You give up pocketability - but I generally wear a sports jacket, and the mini would fit in the jacket pocket.
What do people think - one device or two?