The 13” iPad would be welcome for a number of reasons.
As I am now older, and my eyes are not like they once were, the bigger screen would be great.
We operate into uncontrolled airports through Class G airspace, and the airspace design around our major airports is poor and requires us to maintain ourselves in CTR on decent.
The enroute chart function is difficult to read at the best of times, and the bigger screen would help to read off the CTA steps. (Or ATC could redesign the airspace, yeah, right)
SID/STAR/Taxi charts are getting bigger, equivalent to an old fold out page, and to fit them on the screen they become very small.
Being able to use split screen would be more user friendly on the bigger screen. (If I could get the bastard thing to work😩