All iPads show the full Roon interface. Roon only runs in landscape though – except for the iPad Pro 12.9, that can run in both landscape and portrait.
I use an iPad mini, just the same views but smaller, ie same no of albums
If it only for Roon I would go bigger, Maybe iPad Pro it’s an impressive display. Memory wouldn’t matter unless you plan to use it as a player as well, if so go 128 or 256 maybe
I use a large iPad Pro and Never use portrait. It just doesn’t appeal to me at all. I have no idea why anyone wishes for it, but they do. Each to their own of course.
When you say ‘as a player’ do you mean for on-board storage if music files?
I’m looking to get a Nucleus soon and the ipad will be for Roon and general browsing/YouTube. Can’t see the need for 4G as it’ll be staying in the house.
I didn’t know the iPad Air 2 is 4 years old, but a friend uses an Air 2 with Roon and seems happy with it.
The UK price for a current iPad (non-Pro) is £409 with 128gb or £319 with 32gb. I was told 32gb is quite low, and will cause problems once the device starts to age as the updates start taking up all the space affecting performance. The Air 2 I’ve seen is £200 preowned so I thought it seemed a good deal. Maybe I’m wrong to assume so.
That’s a non issue for me.
Once a year when the new iOS version is released I simply backup the device using iTunes and then restore it.
What it essentially does is format the storage, install a fresh os and restores the backup. The device goes back as it was, without all of the updates taking up space.
I bought an iPad 2018 from ebay for £207. You just need to shop around and do some bargaining. 32GB is fine for me because its only going to used for roon remote.